Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a21a11e4717d46b…

MALICIOUS

PDF

77.3 KB Created: 2021-03-02 10:11:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 80a18f8353527181ece6bf7bb8c67309 SHA-1: 0832b90f7985e86cde31742b940170b9c015f16b SHA-256: 9a21a11e4717d46b908c8bb626641fde64857f4f8ad17b91e6e6c1599c6fc6ca
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm by heuristics. The ML classifier and ClamAV detection strongly indicate maliciousness, with the primary function appearing to be directing users to external resources. While no scripts were explicitly extracted, the nature of the link farm suggests it could be used for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://leonvi.ru/123?utm_term=talend+tutorial+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373986/normal_601e05c682d4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382962/normal_5fdeaaa2d1c8b.pdfIn PDF document text
    • https://noguvipeves.weebly.com/uploads/1/3/4/7/134717425/poxutasududajud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490377/normal_6033b666d0d04.pdfIn PDF document text
    • https://puxodemidumez.weebly.com/uploads/1/3/5/3/135345879/pulufolewa_rugemujelarexuk.pdfIn PDF document text
    • https://guwawafike.weebly.com/uploads/1/3/5/3/135338161/c163984d06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466135/normal_603c6f0baa48d.pdfIn PDF document text
    • https://cdn.sqhk.co/jorisuzil/g1hbgem/best_hair_salons_in_los_angeles_county.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457849/normal_600aaaa7858c3.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/o2jdXkP/wuvafijusijajabivupapolu.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/hibidoJ/paytm_mobile_recharge_offers_idea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476765/normal_5fce52972b146.pdfIn PDF document text
    • http://test123test.xyz/60525116969k21c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461216/normal_602909c6c80d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411250/normal_6007779af0f31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449793/normal_602540c753f6f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://punegejofuj.epizy.com/bulafu.pdfIn PDF document text
    • http://nilavoforejexo.rf.gd/suwugiwukegapenoxazonibom.pdfIn PDF document text
    • http://xixagitaderakon.epizy.com/what_is_justice_in_society.pdfIn PDF document text
    • http://zewalevedesibab.epizy.com/dafafasodobes.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 4592 bytes
SHA-256: efe805f7fc6d6e953418108bbbc9541764846f29c78f96ced56617a7d2e73a98
font_01_sfnt_off000103a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A3 10640 bytes
SHA-256: c742c70fc745f3b2d68c48405fcc5d255074dd7451562b44796b921b390f674e

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