Malicious PDF — malware analysis report

Static analysis result for SHA-256 e645e5e004448393…

MALICIOUS

PDF

84.5 KB Created: 2021-04-02 13:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1e4432c74e97ef13074cf0450e5a3b91 SHA-1: ee72a9fe4302496201db1071c0fd5c7ec9f0605f SHA-256: e645e5e0044483933ac685ecd7c7b89dbd5ae77e66e7c89a42f22d6e0aec87aa
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam tactic. The primary URL, 'https://leonvi.ru/award?keyword=vocabulary+words+pdf+free+download', is presented as a lure for free vocabulary word downloads. While no scripts were explicitly extracted, the PDF structure and extensive link farm indicate a malicious intent to redirect users to potentially harmful websites, aligning with phishing or malware distribution schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/award?keyword=vocabulary+words+pdf+free+download PDF link annotation
    • https://suwuvonujijipi.weebly.com/uploads/1/3/4/0/134042364/kujedu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367631/normal_5fc5e5c60dec9.pdfIn PDF document text
    • https://jeponiruwapin.weebly.com/uploads/1/3/0/7/130776483/texufirer.pdfIn PDF document text
    • https://dixapixukezawe.weebly.com/uploads/1/3/5/3/135388261/winodoxedivider.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444357/normal_5fef46ef9c6e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470687/normal_6027aba9e2e92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373241/normal_600352259b3e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466391/normal_6012ddfc29483.pdfIn PDF document text
    • https://rafifawu.weebly.com/uploads/1/3/4/0/134042442/9856232.pdfIn PDF document text
    • https://bekazavaf.weebly.com/uploads/1/3/5/3/135327011/d6bd15641.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452161/normal_6052a7f33ca94.pdfIn PDF document text
    • http://sutunir.22web.org/2631643729.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464314/normal_5fe5628e90b20.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://09d7e2b9-79a3-4876-9e00-73a1ba4263a4.filesusr.com/ugd/92fcd7_559e2ea2199b4d0cbf7fb3a99a226af8.pdf?index=trueIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_cdc0802f92e548b0bfc4a8cc2f6fe806.pdf?index=trueIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_09153761dd8b4754a4491023aad1b476.pdf?index=trueIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_d437fc6016e343fb83fc3a8a604b33da.pdf?index=trueIn PDF document text
    • http://bozusofofutuv.rf.gd/gcuf_degree_verification_fee_challan_form.pdfIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_6f42f0cc963c4cd6ab61385893c7ccc9.pdf?index=trueIn PDF document text
    • http://dejiwupije.epizy.com/25631592611.pdfIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_ff59271ec005477e94237842c667d4ca.pdf?index=trueIn PDF document text
    • http://kofezinidabefu.epizy.com/how_to_put_plantronics_bluetooth_into_pairing_mode.pdfIn PDF document text
    • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_63c070a0eee1404a8c198ef72cfe80d4.pdf?index=trueIn PDF document text
    • https://c8d0f166-86fd-441b-8df5-aa5e6c6c7644.filesusr.com/ugd/f4b3af_3b3f2cb6bd2243688a607d965ceddbad.pdf?index=trueIn PDF document text
    • https://a1b876fd-e98f-4594-996d-fc523792ae9e.filesusr.com/ugd/efcbf0_2d58cc29a1a24476b4d02107dcbfaf85.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF4 5448 bytes
SHA-256: f8d94bd7f9f1f99f600072a1cd907e98c20471d7ace9534426eb2a1900778d96
font_01_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 2092 bytes
SHA-256: 9fcfd2b2c12c9d480c0beec3ee39f05b9e518edc5177a7a5fcc68dff0371f8a2
font_02_sfnt_off00010837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10837 11108 bytes
SHA-256: 83900d2728a0a40734aa5b99e3e2f55303cf0391b406952ea837659147a70684
font_03_sfnt_off00012e46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E46 16168 bytes
SHA-256: bcfecb9fde4b74e4a2b692e15caf305b2988a1cfe4c6386614002e38d35feb86

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