Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85f1521ecbf4327…

MALICIOUS

PDF

34.5 KB Created: 2020-05-16 02:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: a7f434ce5c1c3daac790da5af2c4c270 SHA-1: 5ab923235a361b77ae63112f0caabe85897e21a2 SHA-256: e85f1521ecbf432747dbaa68b22255a903d70add29fcd092f91c171c6c44c0fd
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains. This behavior is indicative of an SEO poisoning or link farm attack, designed to drive traffic to malicious content or exploit kits. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, limiting the ability to determine a specific payload delivery mechanism.

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://4tammer.com/uploads/1/3/0/7/130776083/130776083.html#comcast+x1+remote+guide PDF link annotation
    • http://horticycle.com/uploads/1/3/0/3/130323196/bagovifub.pdfIn PDF document text
    • http://theatrestudentunion.com/uploads/1/3/0/4/130488365/xolusuku.pdfIn PDF document text
    • http://eastwestmassageandyoga.com/uploads/1/3/0/4/130483895/64f52770ee16.pdfIn PDF document text
    • http://lizdemigreen.com/uploads/1/3/1/3/131383318/9013981.pdfIn PDF document text
    • http://colourfulsunshine.com/uploads/1/3/1/8/131855981/3484472.pdfIn PDF document text
    • http://zamor-glenroy-and-cass.com/uploads/1/3/0/5/130590499/xegibesesesudelaxa.pdfIn PDF document text
    • http://thepostpakonline.com/uploads/1/3/0/6/130620491/616eaaac.pdfIn PDF document text
    • http://ember.agency/uploads/1/3/0/5/130589123/983759.pdfIn PDF document text
    • http://thestickermill.com/uploads/1/3/1/6/131637024/radidetejegimedapilo.pdfIn PDF document text
    • http://cenovelcritiques.com/uploads/1/3/0/4/130436136/zuduwologuwimupug.pdfIn PDF document text
    • http://manishasharma.info/uploads/1/3/0/3/130379625/dejurakazanere.pdfIn PDF document text
    • http://healyourself-healyourworld.com/uploads/1/3/0/3/130313345/8ad565b293d13c1.pdfIn PDF document text
    • http://tourforthecure.ca/uploads/1/3/0/4/130483050/1a249.pdfIn PDF document text
    • http://wowlis.com/uploads/1/3/0/5/130589246/58812.pdfIn PDF document text
    • http://thecxpractice.com/uploads/1/3/0/5/130543543/8c5d9158a.pdfIn PDF document text
    • http://housebythelakephuket.com/uploads/1/3/0/6/130603855/novafunu.pdfIn PDF document text
    • http://jayrosetravels.com/uploads/1/3/0/4/130435597/mamegalu-dowizirupuxi.pdfIn PDF document text
    • http://badmamablog.com/uploads/1/3/1/3/131383204/72c6534f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 7

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_off00005bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BFE 10212 bytes
SHA-256: f51f7583cf9bd54601a5822087bf1956fcc83ccd4cce53c964450d9ec79ffbea

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