Malicious PDF — malware analysis report

Static analysis result for SHA-256 520b74557b2d0881…

MALICIOUS

PDF

36.7 KB Created: 2020-06-03 14:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 7ef34a3fb62ebb10c98339ef43fdead9 SHA-1: 165414e69c859ec8b63a31d00dd47a123ef66e9d SHA-256: 520b74557b2d08817e92cf191edb3f7ac06eb562a992a742d43e5d71adfd5146
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or SEO poisoning attack. The document body contains a title related to regulatory affairs, likely a lure to attract clicks. No scripts were extracted, and the primary malicious activity appears to be directing users to a large collection of external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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 http://rescueourriver.com/uploads/1/3/0/5/130547552/130547552.html#fundamentals+of+us+regulatory+affair PDF link annotation
    • http://mx.legion22.org/uploads/1/3/0/4/130476104/5208567.pdfIn PDF document text
    • http://superfunyard.com/uploads/1/3/0/7/130740049/tekorumonolowit.pdfIn PDF document text
    • http://loveengineered.com/uploads/1/3/1/3/131398064/tezijukapajolasebav.pdfIn PDF document text
    • http://mcmurtrymudrun.com/uploads/1/3/0/5/130542912/tevake.pdfIn PDF document text
    • http://coveinnnaplesbay.com/uploads/1/3/1/4/131438453/xisatik.pdfIn PDF document text
    • http://xoswedishhollyxo.com/uploads/1/3/1/4/131437886/nogozudavesonowitoj.pdfIn PDF document text
    • http://mta-sts.mail.avcri.com/uploads/1/3/0/6/130621217/26c583549e913ff.pdfIn PDF document text
    • http://zenit-museumsbau.de/uploads/1/3/1/3/131381450/nazale.pdfIn PDF document text
    • http://cetonantzin.org/uploads/1/3/0/9/130969426/doseg.pdfIn PDF document text
    • http://mail.cocoabeachalehouse.com/uploads/1/3/0/7/130776754/51f716a1.pdfIn PDF document text
    • http://webdisk.lawyerslendahand.org/uploads/1/3/0/5/130540619/5435674.pdfIn PDF document text
    • http://materialgirl4me.shop/uploads/1/3/0/6/130604445/8441634.pdfIn PDF document text
    • http://rescueourriver.com/uploads/1/3/0/5/130547552/terms.htmlIn PDF document text
    • http://rescueourriver.com/uploads/1/3/0/5/130547552/dmca.htmlIn PDF document text
    • http://rescueourriver.com/uploads/1/3/0/5/130547552/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://rogumebove149811638.files.wordpress.com/2020/05/61563380754.pdfIn PDF document text
    • https://suxeniruwip.files.wordpress.com/2020/05/beratijeleg.pdfIn PDF document text
    • https://tavijoga.files.wordpress.com/2020/05/55425652876.pdfIn PDF document text
    • https://mozujunovuj.files.wordpress.com/2020/05/kezupenamano.pdfIn PDF document text
    • https://zujanonazuk.files.wordpress.com/2020/05/xazodapaku.pdfIn PDF document text
    • http://site86685.mywhc.ca/uploads/1/3/1/4/131408056/xagigiwukex-leguvupagegumej-lebubijetekiki.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6247 10628 bytes
SHA-256: bbe434a025424b38549d9efed4e73c54beb58f34680605f6974ae7dfb525393f

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