Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98e2c101d87f157…

MALICIOUS

PDF

74.0 KB Created: 2021-03-31 02:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: fd8bdb349c09d4d6611da7089d22d188 SHA-1: ebb82935f4646216481d73c9927804ce3849f93d SHA-256: b98e2c101d87f15704459e1f9ecf5f638fd122cdf8d79046cfde1b2151b6ebad
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though partially corrupted, references 'Buzzfeed which accent is sexiest', likely a lure to drive traffic to the malicious URLs.

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://fokemale.ru/strik?utm_term=buzzfeed+which+accent+is+sexiest PDF link annotation
    • http://sudilufib.getenjoyment.net/rgles_d_orthographe_d_usage.pdfIn PDF document text
    • https://finamiwowekizo.weebly.com/uploads/1/3/2/3/132302732/vosedu.pdfIn PDF document text
    • https://roluwisotem.weebly.com/uploads/1/3/4/3/134368144/niridon.pdfIn PDF document text
    • https://wegoboxup.weebly.com/uploads/1/3/4/7/134772399/fexokij.pdfIn PDF document text
    • https://gesamuju.weebly.com/uploads/1/3/1/4/131453574/bezeran.pdfIn PDF document text
    • https://numokafi.weebly.com/uploads/1/3/2/6/132695525/c057c3d445ec650.pdfIn PDF document text
    • http://lowuwirakob.66ghz.com/52702913472.pdfIn PDF document text
    • https://julavatevimire.weebly.com/uploads/1/3/4/6/134669339/zopevesoj.pdfIn PDF document text
    • https://zolaverapudo.weebly.com/uploads/1/3/0/8/130874102/3583975.pdfIn PDF document text
    • http://laludinemolat.sportsontheweb.net/graphing_rational_functions_examples_with_answers.pdfIn PDF document text
    • http://situvupumu.medianewsonline.com/conducting_polymers_review.pdfIn PDF document text
    • http://subikizivuwen.22web.org/certificado_medico_secretaria_de_salud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_d5aa49e87c7c41b1a05147d3461e3899.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farowug/10739544006.pdfIn PDF document text
    • https://6731adf0-0bfb-4e29-9024-dbf0b6c78d19.filesusr.com/ugd/163ed7_801570b2ee11427e807d7db266708132.pdf?index=trueIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_3c1351b6e87c4a8da086238166f21d8b.pdf?index=trueIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_4d7a30c51f894d389da32d81446449bf.pdf?index=trueIn PDF document text
    • http://tajazenu.rf.gd/anywhere_usb_software.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/zetej.pdfIn PDF document text
    • http://lobulowigewimu.epizy.com/character_creator_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/42256736186.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_off0000e3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EA 5240 bytes
SHA-256: 7dfb059d4eae96168a40799d560579ec9e5d685194a4549dc3f3569dccfec7ed
font_01_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 11052 bytes
SHA-256: 89714b503fab65f5b03a1b43601cc6237f45ca9af8b271adef29960754d36aaf

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