Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b975b67f3a8916…

MALICIOUS

PDF

83.6 KB Created: 2021-02-14 13:43:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2e57a404805fddbcb3917f896df3c4a4 SHA-1: 6c0b87669b92a14bcd0f63bd016abcf06c92703e SHA-256: d2b975b67f3a8916d3f31ef12dbaee2b3201c4426211c92211eccf530c10ef1e
146 Risk Score

Malware Insights

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

The PDF file contains multiple heuristics indicating malicious intent, including being flagged as a link farm on disposable hosting and a callback phishing lure. The ML classifier and ClamAV detection strongly suggest maliciousness. The embedded URLs, particularly 'https://baarspo.ru/123?utm_term=ccna2+rse+practice+skills+assessment+pt+type+b', likely serve as the initial lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://baarspo.ru/123?utm_term=ccna2+rse+practice+skills+assessment+pt+type+b PDF link annotation
    • http://basvuruizleme.online/chu_chu_tv_rhymes_free_3gpqedhx.pdfIn PDF document text
    • http://oneitshop.info/wokodevasemifowubasivupux1yye8.pdfIn PDF document text
    • https://gitosupogule.weebly.com/uploads/1/3/2/7/132741155/3425851.pdfIn PDF document text
    • https://toxosujaduwo.weebly.com/uploads/1/3/0/8/130874389/98978e005.pdfIn PDF document text
    • http://kurs1.xyz/25119824425lpdo2.pdfIn PDF document text
    • https://bupogoduvokog.weebly.com/uploads/1/3/4/6/134690502/jutawuri.pdfIn PDF document text
    • http://xivusolokedujes.22web.org/folividoteb.pdfIn PDF document text
    • http://8bitbeardsco.com/elements_of_programming_stepanovy1rzu.pdfIn PDF document text
    • https://gopebuxagofu.weebly.com/uploads/1/3/2/6/132681698/liwofefewo.pdfIn PDF document text
    • http://mishabelle.ru/38641323412c3vcr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/sivovofegawezanirevusi.pdfIn PDF document text
    • http://kajufikuxididon.rf.gd/tubuxojogapakiwomurojawu.pdfIn PDF document text
    • http://zobawukesilebaf.epizy.com/mapeguwoleromefetufidi.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/gwent_guide_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/bin_sachivalay_clerk_old_paper.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_off000109b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 5424 bytes
SHA-256: 1a0ff72fb2b61398b66b89a59a248ca30f7da5a668c521de548cba9caa210b8b
font_01_sfnt_off00011c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C18 11576 bytes
SHA-256: e9e6ad74cd6b46d637081b9632429d64d5d1880b3e39105bdfc9cd69731a9bf3

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