Malicious PDF — malware analysis report

Static analysis result for SHA-256 1726a40fdaeec9b2…

MALICIOUS

PDF

90.7 KB Created: 2020-11-22 15:40:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 546916a74b1b395b46ab3b30ceb7460c SHA-1: 7625884c028582e3ddb3c22bc7ad40b30e125d4f SHA-256: 1726a40fdaeec9b2bbbd7691e414e3648cc68b1b8cffcdf54db7a351df1a9bf8
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links suggests an intent to lure the user to a compromised site, likely for phishing or further malware delivery. The document body appears to be malformed or obfuscated, containing what seems to be metadata rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=doreiku+anime+characters In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_5f9729905cc33.pdfIn PDF document text
    • https://kudowelevuk.weebly.com/uploads/1/3/4/5/134585456/bitivapakupuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_5f94d1c626713.pdfIn PDF document text
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/zawumowodida.pdfIn PDF document text
    • https://fubabogi.weebly.com/uploads/1/3/4/6/134617409/82b540d.pdfIn PDF document text
    • https://kubamugikogili.weebly.com/uploads/1/3/4/5/134508843/696327.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368503/normal_5fa3aaed472c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380695/normal_5fa31b2babcd1.pdfIn PDF document text
    • https://rikurifijuse.weebly.com/uploads/1/3/4/6/134681474/4130a012120f.pdfIn PDF document text
    • https://juzapojoxop.weebly.com/uploads/1/3/4/3/134370352/gezolisexizuv.pdfIn PDF document text
    • https://josugonu.weebly.com/uploads/1/3/4/4/134488469/sifetobaboborunegat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5f883b3bef0c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453332/normal_5fb447bfeda2c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5bd1e03-c8fa-4f9b-8c99-a776166cae8a/86707131773.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 15264 bytes
SHA-256: ac74b888f9ff8aed34e6ca052f3688ec82d5755dfecf7ed9fa96332513596982
font_01_sfnt_off00012810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12810 5068 bytes
SHA-256: ad646e4e8aec197be2cbddd5cd94f55c1269462bf8a98b8adb076ff0ed85352f
font_02_sfnt_off00013928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13928 10928 bytes
SHA-256: fd606750d792e695525af6976bf032aa041f0598ed5aa6ad2bea2ecddfafccc5

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