Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8129fcfa4661f9e…

MALICIOUS

PDF

40.0 KB Created: 2020-04-01 11:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e94b8acbf82998658d652b1420069355 SHA-1: eb097bd729b492f3bf93dab9812f4b44c097f8a0 SHA-256: d8129fcfa4661f9eecfb26d571b261526dcd88157a4f63aba9f51194bedffaab
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, many of which point to similarly structured URLs on different domains. This pattern is indicative of a link farm or SEO manipulation tactic, often used to distribute malicious content or to artificially inflate search engine rankings for malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://irieint.com/uploads/1/3/0/5/130539763/130539763.html#imagenes+de+alimentos+saludables+para+ni%C3%B1os+animados
    • http://mykcooper.com/uploads/1/3/1/0/131069886/joridikajuj_fudasokisu.pdf
    • http://e9n.org/uploads/1/3/0/6/130621801/f305a5975.pdf
    • http://stephanienelsonbooks.com/uploads/1/3/0/8/130814283/32288f0deebc.pdf
    • http://apostlepatministries.org/uploads/1/3/0/7/130776734/9998139.pdf
    • http://sprinklerrepairfresno.com/uploads/1/3/0/5/130550833/zedujiko-nozebujexuniked.pdf
    • http://leaguedesmoines.com/uploads/1/3/0/4/130488584/c27d7b622c4d701.pdf
    • http://prosewersvc.com/uploads/1/3/1/0/131069893/vigowamotuzaj-degumigimufed-pusenikenujuxud.pdf
    • http://txstateacctclub.com/uploads/1/3/0/6/130620375/2452242.pdf
    • http://tompfeifer.net/uploads/1/3/0/5/130543476/13b4b.pdf
    • http://myjadenonline.com/uploads/1/3/0/4/130489172/tapen-fafadese-digixexozu-zujulafegaw.pdf
    • http://nano-living-system.com/uploads/1/3/0/8/130813898/1692359.pdf
    • http://mollyharperactress.com/uploads/1/3/0/6/130640110/5db809.pdf
    • http://www.evitajesthetics.com/uploads/1/3/0/7/130776363/rigef.pdf
    • http://visionofbeautydesign.net/uploads/1/3/0/5/130550660/jozefun.pdf
    • http://bodymindandsport.club/uploads/1/3/0/7/130776268/ripamonobefunu.pdf
    • http://makeyoursoulbreathe.com/uploads/1/3/0/7/130775791/pazaroxiwerar-ruwaka-walidopisil-surovabow.pdf
    • http://hostmaster.maxwelljc.be/uploads/1/3/0/4/130489247/19572daac8a13.pdf
    • http://kabadmusicgroup.com/uploads/1/3/0/5/130542863/widekinatu.pdf
    • http://pianellilawfirm.com/uploads/1/3/0/2/130291696/wezujibamenibufotuzu.pdf
    • http://cleanbean.coffee/uploads/1/3/1/3/131379498/9112897.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_off000071cd.bin
78b7da388c94a26b711e9caca8b6c1ef2c3a46071e9d90699b4891ef7b7da6c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x71CD 8140 bytes