Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f9011b1db8db37…

MALICIOUS

PDF

86.6 KB Created: 2021-01-26 00:56:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e0b815c3612d65c9f213849e2a280d45 SHA-1: 6043603871a2585839a07edb5996693063b0c0a9 SHA-256: a7f9011b1db8db3704b58a4ec8cb7dc9e84ef8ca1bccb2d0a8f52046399cda0b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains references to live streams, suggesting a lure to attract users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://druttle.ru/123?utm_term=steelers+vs+bengals+live+stream+reddit PDF link annotation
    • https://varudigenaka.weebly.com/uploads/1/3/4/5/134597471/kasuzalovemuwi.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/jXUjjhg/black_and_red_ombre_coffin_nails.pdfIn PDF document text
    • https://cdn.sqhk.co/zufuxirap/chdhcjj/black_friday_ads_2020_lowes.pdfIn PDF document text
    • http://lorenbayi.com/pusapozedusaxnuotv.pdfIn PDF document text
    • http://lojotiwutorolad.22web.org/rudsak_size_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/jUihLJR/harvard_affirmative_action_statistics.pdfIn PDF document text
    • https://cdn.sqhk.co/wiberini/jighJy6/uncharted_2_fortune_hunter_edition_ebay.pdfIn PDF document text
    • http://zawoxilejaku.66ghz.com/industries_qatar_annual_report.pdfIn PDF document text
    • https://pelosewedi.weebly.com/uploads/1/3/4/7/134753512/2735988.pdfIn PDF document text
    • https://cdn.sqhk.co/sanevujaguda/efFwDKI/pakikex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kowewewabozete.epizy.com/synonym_worksheet_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/38494349534.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/dunutap.pdfIn PDF document text
    • http://miduzusajaveg.rf.gd/agreed_upon_procedures_report_ey.pdfIn PDF document text
    • http://nalirabagetovop.epizy.com/biography_template_for_middle_school_students.pdfIn PDF document text
    • http://bulujulu.rf.gd/google_chrome_exe_uptodown.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_off000114da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DA 5448 bytes
SHA-256: ac48fce3942700a095aa0b89492736082334410410719b9c879b37992d897775
font_01_sfnt_off0001274a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274A 11332 bytes
SHA-256: 61bff761cb443b91b2ebb9ce6ef3dfdd2fd5d798263d013bc53992043577f363

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