Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f3161e4944a74f…

MALICIOUS

PDF

54.3 KB Created: 2020-03-26 09:23:27 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d96f94661448b5753d8216f71541c234 SHA-1: ccb72b1ac38cd3e6ecbebe8a8495b2a7ab330c75 SHA-256: 37f3161e4944a74faf72fe411922aefa6ac79d8b919f818ef6f88ebb7dd926e5
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. The ML classifier also flagged this PDF as malicious with high confidence. The primary attack pattern appears to be a link farm, directing users to numerous unrelated websites, likely for SEO manipulation or to serve as a distribution point for further malicious content. No scripts were extracted from this sample.

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://coachchrismahan.net/uploads/1/3/0/4/130476146/130476146.html#pr%C3%A9+modernismo+exercicios+resolvidos+pdf
    • http://hostmaster.thewardrobecurator.co.uk/uploads/1/3/0/4/130483871/kasovodivure.pdf
    • http://kandkeventsanddesigns.com/uploads/1/3/0/6/130639877/fajotiwulojiku_fetenug_mejaxakuxunu_fakatu.pdf
    • http://themastectomystore.com/uploads/1/3/0/6/130621282/zuzuwek.pdf
    • http://lidsajar.com/uploads/1/3/0/4/130488328/501768.pdf
    • http://wacopestpros.com/uploads/1/3/0/5/130551704/finuxijafoxiwob.pdf
    • http://smartyfact.com/uploads/1/3/0/4/130488141/d8e3bcf6b7210eb.pdf
    • http://ferritergroup.com/uploads/1/3/0/5/130547275/xigekujulotud-viwovusuvewimiv.pdf
    • http://mayaoak.club/uploads/1/3/0/5/130539497/4712335.pdf
    • http://forktotheleft.com/uploads/1/3/0/5/130590481/talumopavufeva.pdf
    • http://www.purejoyce.com/uploads/1/3/0/7/130775050/1170608.pdf
    • http://pioneercareercenter.com/uploads/1/3/0/6/130640142/zatakupupufe_larekujivoduk.pdf
    • http://insighteditingservices.com/uploads/1/3/0/4/130483577/fosoduxejeja-jilifovu-wiwopokuzekan.pdf
    • http://mediasunwin.com/uploads/1/3/0/8/130813141/fdbcb040610.pdf
    • http://www.loaves4life.org/uploads/1/3/0/4/130483354/2378505.pdf
    • http://tlclandscapesmentor.com/uploads/1/3/0/4/130476878/3961281.pdf
    • http://insuremybar.net/uploads/1/3/0/4/130476519/pufomode.pdf
    • http://www.talkingaboutart.org/uploads/1/3/0/7/130775465/4913789.pdf
    • http://tr.daphneconsulting.com/uploads/1/3/0/6/130621989/ad793.pdf
    • http://openwalnutcreek.org/uploads/1/3/0/5/130551589/fuxavol.pdf
    • http://gwozdziewycz.com/uploads/1/3/0/5/130543667/vowim-remamof-jametugegub.pdf
    • http://professorkenney.com/uploads/1/3/0/2/130289482/mesifi.pdf
    • http://mourntolight.com/uploads/1/3/0/6/130639023/1358639.pdf
    • http://amatowoodcrafts.com/uploads/1/3/0/4/130483986/bae7701f88953c2.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a716.bin
b517d30a41878d1dd3fc77d06641cda914fbf0a86cab8a1f1ca8334d2ed66d69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA716 10268 bytes

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