Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b55248db4810260…

MALICIOUS

PDF

41.8 KB Created: 2020-04-03 03:40:48 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 33fd91ca152220c88c258bf1cde182a5 SHA-1: a3cf2aaf472cd2a5eb7887a3c9c5bd142bc09de2 SHA-256: 7b55248db4810260fbb5533318aeca2415cf65e4bc14d5f54896eec4564e5907
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to external PDF files, indicative of a link farm or SEO poisoning attack. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to redirect users to potentially harmful content. No scripts were extracted, but the structure and URL patterns are highly suspicious.

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://bsa-sccc-pack301.com/uploads/1/3/0/2/130270893/130270893.html#carta+escrita+en+el+a%C3%B1o+2070
    • http://mesacabin.com/uploads/1/3/1/4/131406835/3491084.pdf
    • http://firebubbles.net/uploads/1/3/0/6/130621194/49b532.pdf
    • http://dreamhizellc.com/uploads/1/3/0/6/130604615/4197713.pdf
    • http://purposeinlife.info/uploads/1/3/0/4/130483242/konapefupifuw-sarawadiw.pdf
    • http://mountaingatewaytraining.org/uploads/1/3/1/3/131379732/fowotukokazojo_ledufev.pdf
    • http://witneycollectables.com/uploads/1/3/0/5/130541623/d01aa14c6585.pdf
    • http://theglassnugget.com/uploads/1/3/0/2/130274378/9a7d4.pdf
    • http://clovercollaboration.com/uploads/1/3/1/1/131164038/tigeb-jovesoju-migovaza-ruvev.pdf
    • http://thewallables.com/uploads/1/3/0/6/130604787/luxizoweturezixum.pdf
    • http://goldcreektennissports.com/uploads/1/3/0/6/130639744/a0ece393a.pdf
    • http://blackburncreative.net/uploads/1/3/1/1/131164456/nidosujupegilo.pdf
    • http://riverpointhealth.com/uploads/1/3/0/4/130476255/kaxapavumi.pdf
    • http://savantpublishing.com/uploads/1/3/0/7/130776016/152588.pdf
    • http://2401cedarspringsmarketing.com/uploads/1/3/0/2/130271184/suzidixep_jotid_xorawoburu_jarelop.pdf
    • http://davesroofingmaine.com/uploads/1/3/0/2/130289172/4bd4477fdd31d4.pdf
    • http://mindregard.com/uploads/1/3/1/4/131453269/xaguver_nujelida.pdf
    • http://damillerphotography.net/uploads/1/3/0/8/130874536/8719907.pdf
    • http://babybloominfantmassage.com/uploads/1/3/0/6/130604181/lanisegosolomoz.pdf
    • http://myzta.com/uploads/1/3/0/2/130288502/rufisumirov.pdf
    • http://coachgestao.com/uploads/1/3/0/4/130477170/3784660.pdf
    • http://newworldhousemedia.net/uploads/1/3/0/6/130621656/91ff04ea3.pdf
    • http://demigracesblog.com/uploads/1/3/1/4/131407742/waraf_givaxalejugur.pdf
    • http://ukboulders.com/uploads/1/3/0/5/130551505/lofis_mowobigiv.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_off0000763a.bin
513abd6d1797ea32cde05b028d6e6e3bc01fe2900a2025f4012c08268626998f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x763A 9372 bytes

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