Malicious PDF — malware analysis report

Static analysis result for SHA-256 588b0a255b385ff2…

MALICIOUS

PDF

91.5 KB Created: 2021-03-14 17:21:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: abdd68f5051cce0c469971f33e64bdd9 SHA-1: a935633ae0947e5edc0b2035b3f586f1130c8f92 SHA-256: 588b0a255b385ff2f50f01aa5d4c6256d70a0040d4ea27d6f54d49bd4ae379c8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, characteristic of a link farm or SEO spam. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/wix?keyword=bitonality+define+music PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475995/normal_60199b69231fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460055/normal_6039b1ec4da55.pdfIn PDF document text
    • https://sagudazotimoja.weebly.com/uploads/1/3/4/7/134753003/fizukisowal-kivigupipozot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476780/normal_6012d5991f10b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418567/normal_600c90410ab26.pdfIn PDF document text
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/senefafi_nuwenaziti_vimukufalekepu_pafeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449406/normal_5fcf6e4004d7b.pdfIn PDF document text
    • http://tedoterolileme.iblogger.org/bosch_500_series_dishwasher_user_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394077/normal_602b9a3599460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428331/normal_603d18b513a42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_9f9ed9a7cf3649ae83d6c7aab934d51e.pdf?index=trueIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_f3f1045ebe8544228d848374018a6835.pdf?index=trueIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_a24d0389f4db4ef0adc5316ef4f122be.pdf?index=trueIn PDF document text
    • http://tonerud.epizy.com/lymphocytic_colitis_diet.pdfIn PDF document text
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_3ae8eef3bab145bebb53116e2f2eeb69.pdf?index=trueIn PDF document text
    • https://c63359c4-faa5-40af-ad11-254ddd3d100c.filesusr.com/ugd/838c33_1ed8e4c4c54242f49b31520576d500ee.pdf?index=trueIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_7955a96b038546aca1936dc9e0b8c34e.pdf?index=trueIn PDF document text
    • https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_0207e28a277945a3bbe2b346ce8073d2.pdf?index=trueIn PDF document text
    • http://nejovafejasujob.rf.gd/byronic_hero_characteristics.pdfIn PDF document text
    • http://zusewijoje.epizy.com/disawisopubamonedikifeb.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
    • 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_off00010508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 5224 bytes
SHA-256: f803dd8fd4c0769875d2609b37ba1d91034307907feb6de7fb3155500aa1eee8
font_01_sfnt_off000116cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CD 12312 bytes
SHA-256: fc05208016488d6847ddfb8356785e265e7c019c9fac02858d936ed7e3ec4dfa
font_02_sfnt_off00013e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E15 16120 bytes
SHA-256: 73e2bae015806fcbcea00a5e77fef36cf57312733aebee32ba98308b5ce41d75
font_03_sfnt_off00015337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15337 3144 bytes
SHA-256: 618506183e4ca9d6117e3b22d6dd8efab061e99cc137245fd29a4ed4c54ab0a2

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