Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1453ac1f87e5b4…

MALICIOUS

PDF

76.9 KB Created: 2021-03-17 11:34:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 73e55c58347e6381628b5a8ef89d2c72 SHA-1: 0a66945495046934a939038a688df145281d8ba6 SHA-256: cc1453ac1f87e5b43d593dd9ff332d20c1dafa133538c35d61b7094293ec105b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One prominent URL, 'https://maypoin.ru/strik?utm_term=why+does+my+honda+pressure+washer+not+have+pressure', appears to be a lure for users searching for specific technical issues, likely leading to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/strik?utm_term=why+does+my+honda+pressure+washer+not+have+pressure PDF link annotation
    • https://nimafomu.weebly.com/uploads/1/3/2/7/132710507/e2bac4479.pdfIn PDF document text
    • https://pudorexejuvaw.weebly.com/uploads/1/3/1/4/131455832/kubiz-pegilugarobowik-zawopasezepukif-xuvula.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7b806e58-2e0f-4c22-b5e1-e0f71c4d6e86.filesusr.com/ugd/8da65f_5cd5ffe20d1c444cb60958d1933e996a.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_db456c81b96f4e8c8044d7dc21b9cec9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5db674b2-57f1-4f12-b37a-4924c89fbb9c/2013_dodge_avenger_sxt_tire_size.pdfIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_3cfe74e440924d3ea040b136ac7d6802.pdf?index=trueIn PDF document text
    • http://jinugiwi.atwebpages.com/51809796012.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_4702ae24d6794d39902912cafacde7da.pdf?index=trueIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_084d19cf736d4315baeedc8add9f4d1e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5b56ff0-aa87-441e-8ae9-f63734446bd0/66755185286.pdfIn PDF document text
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_98e88c134a5a40a7956d793b8975d819.pdf?index=trueIn PDF document text
    • https://3f054cde-0430-4828-89d0-5f77035cf230.filesusr.com/ugd/d93890_ed92eca453614e21831da9b663b98bfc.pdf?index=trueIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_5868456242f5437898fc64de556dae98.pdf?index=trueIn PDF document text
    • http://zutaturusix.myartsonline.com/17631782494.pdfIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_d790a49840464956923444059d463f21.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 5436 bytes
SHA-256: c89d601f2cb158308aa1227f70678c11b5e3f8c74263943f0c9849f974806056
font_01_sfnt_off0001009e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009E 11324 bytes
SHA-256: f5a96471c56c02bff40f9f5aa8620aa7e65ebc2c2ebde1112b0f24c724de0912

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