Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b98a5b820a46102…

MALICIOUS

PDF

83.2 KB Created: 2020-12-30 19:48:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f1eff8b0e3e8adc29acc8ae28101b1c5 SHA-1: ad5e96c031ea622df34f7db49ec7af0a88036144 SHA-256: 3b98a5b820a46102ff77e564e08fdc0b8cc9d0241184d84cd306eeb8e92355a6
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to a URL that appears to be part of a link farm. Another heuristic flags a 'SE_CALLBACK_LURE', suggesting a phishing or tech-support scam pretext. The presence of external URIs and the overall structure indicate an attempt to redirect the user to malicious content, likely for phishing purposes.

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 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.
  • 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://traffking.ru/123?utm_term=porc-a-fix+porcelain+white+touch-up+glaze PDF link annotation
    • https://cdn.sqhk.co/nepasibuta/bjiiijc/shreya_ghoshal_sad_songs_mp3_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bumadawab/AVkSibP/57663475972.pdfIn PDF document text
    • https://cdn.sqhk.co/sewetotab/criabke/65977180929.pdfIn PDF document text
    • https://cdn.sqhk.co/kapudome/Xijicjc/38001586890.pdfIn PDF document text
    • https://rixokofumi.weebly.com/uploads/1/3/1/3/131380985/5882351.pdfIn PDF document text
    • https://cdn.sqhk.co/pozuwifofub/ii0jfhh/jumpstart_definition_synonym.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/UGJ4utx/berea_college_crafts_store.pdfIn PDF document text
    • https://nukewixe.weebly.com/uploads/1/3/4/3/134385223/591902.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a084a947-b65e-4a69-8d13-0581f7b5aaef/ronavuzukonogonijidisote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/519b6faa-a11c-4c30-87da-1c23704a8be0/17961356929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8d1d961-78c2-43f4-97ea-97ef870db104/the_art_of_styling_sentences_5th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91007b17-9c01-4880-b698-a29bb2a47129/49901059062.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/bronchial_asthma_case_study.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/tumavuzoxoribugofiz.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/aston_martin_vantage_2020_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/70137598576.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_off00010823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10823 5344 bytes
SHA-256: eb2dc380eb31593d5f58a1ef955440dae6d0a33a0a3ea0590c00e8f0f9c792a4
font_01_sfnt_off00011a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7A 10884 bytes
SHA-256: ce1cf4c9fe21c98e6fa8013acae6483d19c05049ab4c43d98f177c0911deea44

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