Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0aa3768a4eec483…

MALICIOUS

PDF

75.7 KB Created: 2021-03-24 10:21:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: bf852bf04ffe0f413217f522eed9aa5d SHA-1: c1260c420ee4d9a9682c8e475272d5cbf85e8749 SHA-256: c0aa3768a4eec48373cd427a03c05240ce26db36da6120a5b87bff450eda549b
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1539 Steal or Forge Credentials

This PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to direct users to malicious sites. The heuristic 'SE_MFA_LURE' indicates the document is likely a credential phishing lure, possibly attempting to harvest session tokens or abuse multi-factor authentication. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://botokaw.ru/strik?utm_term=systems+engineering+or+software+development PDF link annotation
    • https://naxozafo.weebly.com/uploads/1/3/1/4/131483391/nanobazuz.pdfIn PDF document text
    • https://tafifomoku.weebly.com/uploads/1/3/1/8/131856516/c498a774817909.pdfIn PDF document text
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/a29a1647d4.pdfIn PDF document text
    • https://nolulanulupu.weebly.com/uploads/1/3/1/3/131379612/363175.pdfIn PDF document text
    • http://thefortykuti.com/mamupezelitexuf2evdx.pdfIn PDF document text
    • https://juxusuvib.weebly.com/uploads/1/3/0/7/130739690/1949257.pdfIn PDF document text
    • https://talesana.weebly.com/uploads/1/3/4/8/134878252/sufutumanux-gugoteje-lobel.pdfIn PDF document text
    • https://jujoxiro.weebly.com/uploads/1/3/4/8/134875196/rugikuruwepabop-razowunagus-fobasoxapuxu-temibox.pdfIn PDF document text
    • https://nobuzuza.weebly.com/uploads/1/3/4/7/134757083/zesumilaxusuvuwi.pdfIn PDF document text
    • https://turonobofudub.weebly.com/uploads/1/3/4/4/134463989/xepepuposoki.pdfIn PDF document text
    • http://dvestideyli.xyz/ios_13._2_public_beta_27gtey.pdfIn PDF document text
    • https://mugunujepigujov.weebly.com/uploads/1/3/5/9/135992134/ebb02e7ca72659e.pdfIn PDF document text
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/1a2616cadb8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/purufiz/jikekuge.pdfIn PDF document text
    • https://4a1cfc67-5981-466d-a13b-75576fe7431f.filesusr.com/ugd/64e449_d0d3fc0452e641988fcf5911b6233310.pdf?index=trueIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_b6f5366aba1e4b5285348931d0572e42.pdf?index=trueIn PDF document text
    • https://b0b89e74-75d6-43b0-bb8f-fa2cd9bd5f5b.filesusr.com/ugd/b5ae3e_adf1476ce3f04156a105aec8d9577688.pdf?index=trueIn PDF document text
    • https://a96990da-dd17-4b11-844c-aba2d588d1b6.filesusr.com/ugd/5e5e7b_0451f773b54a435dae5714c6469ac686.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gosete/online_acrobat_reader_to_converter.pdfIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_d63a5679bbc746fa9f6a4c35d6489492.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_off0000e9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 5720 bytes
SHA-256: 943743ab7021fe48b2e59d5bac66728275fb7f0b2ee315684c3a1addd65189b3
font_01_sfnt_off0000fd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 10660 bytes
SHA-256: 9272202a49996ad3f5f8d0e1b3f816ea47c3b9693803c754c263631239927154