Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd62b2ffabdc2ab2…

MALICIOUS

PDF

72.2 KB Created: 2021-06-09 15:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9a3baaa8be045150a302853d7b71da0f SHA-1: ad6b751d69c9b21c6c6718cfaa0a3745b253af11 SHA-256: dd62b2ffabdc2ab2dde7304e71b7ce3dfdbf0433bfd9aabf85ae69ebcc9669eb
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links to various domains, many of which are identified as disposable hosting. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting a link farm or SEO manipulation tactic. The presence of a malicious ML classification and ClamAV detection further supports its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/pbw?utm_term=sound+engineering+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427076/normal_60401cbdcef34.pdfIn PDF document text
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/43d56a1fc8eca6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414491/normal_5fd7511952038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501660/normal_5fd15727709ab.pdfIn PDF document text
    • https://mamifonor.weebly.com/uploads/1/3/1/1/131163935/fetepotatove.pdfIn PDF document text
    • https://farazekij.weebly.com/uploads/1/3/4/3/134379469/dotivame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369174/normal_60362ec28f222.pdfIn PDF document text
    • https://talasawag.weebly.com/uploads/1/3/4/2/134265385/3d1e73e785f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466364/normal_6033c57e39c80.pdfIn PDF document text
    • https://joxujodeli.weebly.com/uploads/1/3/5/4/135400218/892f6d2d439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418185/normal_600ff7d68f549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422912/normal_603ee7bdafb46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458125/normal_606b48def0111.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379230/normal_5fec7a4c4d3c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bekivuxuga.pbworks.com/f/mafuxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68feedab-f8bd-4b80-a7fa-840c92c4193a/75054930781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb5c86cb-3d5a-4739-8dca-f16fe3a5f4c1/92839915631.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/f/is_there_a_problem_signing_into_yahoo_mail_today.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/f/28847603744.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4164753-4fb3-4ed3-b15a-c7e2138413a7/blackdecker_12-cup_programmable_coffeemaker_stainless_steel_cm4100s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c7db65c-a885-4ca2-951d-fcfc61cda794/52271539817.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_off0000df8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8A 5096 bytes
SHA-256: 959663009c7ae7d8a689bd99a016107e713b98042630ec8da53db79b009a2b88
font_01_sfnt_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 10228 bytes
SHA-256: 26ef121d25d4240f6320018fde1dfd9aa73620279b4ad370f84329c39a934d11

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