Malicious PDF — malware analysis report

Static analysis result for SHA-256 853a6c765f1848fd…

MALICIOUS

PDF

35.9 KB Created: 2020-06-04 17:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: cd21c8c453d696b9c0791393390211dd SHA-1: 3369d050137c16a27de9728b2e912081e351586e SHA-256: 853a6c765f1848fd980fb38c69191ef8a43164eb97fe2858b881d2805b5a0ab0
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. No scripts were extracted, but the PDF structure itself is indicative of a spam or SEO abuse tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ab.undesirable.us/uploads/1/3/1/3/131382539/131382539.html#trilogy+dl2800+user+manual PDF link annotation
    • http://protechniq.org/uploads/1/3/0/7/130775818/7824649.pdfIn PDF document text
    • http://advanceoklahoma.org/uploads/1/3/1/4/131406365/paxupemes.pdfIn PDF document text
    • http://robinsnestfunraiser.org/uploads/1/3/0/5/130551214/c4c0e10a4.pdfIn PDF document text
    • http://stationeryislandpromo.com/uploads/1/3/0/5/130588478/bojef.pdfIn PDF document text
    • http://stmichaelsumclhc.org/uploads/1/3/0/5/130539350/325605.pdfIn PDF document text
    • http://store.goochipoochi.net/uploads/1/3/1/6/131636763/nupuberopogipiv.pdfIn PDF document text
    • http://capsulelifestyleinc.com/uploads/1/3/1/6/131606808/mogosukupelo.pdfIn PDF document text
    • http://alohaminimalist.com/uploads/1/3/0/6/130620781/5d00bc1fb4e6cd.pdfIn PDF document text
    • http://denisewalther.com/uploads/1/3/0/6/130620909/3439765.pdfIn PDF document text
    • http://molallapool.com/uploads/1/3/1/3/131380786/pimetenasagi.pdfIn PDF document text
    • http://ppo95.dtmgt.com/uploads/1/3/1/3/131383624/mixeduga_xebazebuwib.pdfIn PDF document text
    • http://ellisonmotors.net/uploads/1/3/0/8/130874308/fotupezeripu_wofepiwiso.pdfIn PDF document text
    • http://riverroadcateringandevents.com/uploads/1/3/0/3/130323603/girudepuku_mukakoli_kubiwub_zigilunexope.pdfIn PDF document text
    • http://ab.undesirable.us/uploads/1/3/1/3/131382539/terms.htmlIn PDF document text
    • http://ab.undesirable.us/uploads/1/3/1/3/131382539/dmca.htmlIn PDF document text
    • http://ab.undesirable.us/uploads/1/3/1/3/131382539/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://wutiwewero.files.wordpress.com/2020/06/bomarawixotaxiguvo.pdfIn PDF document text
    • https://nonegek.files.wordpress.com/2020/06/lodanotogiregafemumebig.pdfIn PDF document text
    • https://dipimotez.files.wordpress.com/2020/06/furuxavitelo.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 3

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_off0000627f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x627F 10192 bytes
SHA-256: 9a576202402ca96d5c754083a5472759b1b7d10e44a5fb38c7331c50cbc8c40d

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