Malicious PDF — malware analysis report

Static analysis result for SHA-256 d097b0b7e09dad4f…

MALICIOUS

PDF

77.0 KB Created: 2021-03-31 07:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75db414882e8063517026e0a8156d779 SHA-1: dc73a6eb061fe8c9ab7d4bc96c9fe1d305f83f95 SHA-256: d097b0b7e09dad4fbda7ef60e2736c03f14c5ce9dca675b34da01b17196eb2da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded links, with a significant number pointing to external resources that are likely part of a link farm or phishing campaign. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common vector for exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=online+poker+doyle+brunson+pdf
    • http://classkaod.ru/pusidosmhy4w.pdf
    • http://detonic-buy.website/emulator_ps1_for_windowsfx87j.pdf
    • https://koralazuvumo.weebly.com/uploads/1/3/1/8/131871516/4921320.pdf
    • https://cdn.sqhk.co/tidaxetosi/B65Siho/difference_between_race_and_ethnicity.pdf
    • http://de-bewertung-id2842384.icu/91738878834vttgv.pdf
    • https://cdn.sqhk.co/lobinazema/ihhthef/dead_ahead_zombie_warfare_hack_pc.pdf
    • http://on24-system.club/deutsch_adjektivdeklination_bungenz3o4m.pdf
    • https://cdn.sqhk.co/karadirimose/gjXjfig/9626733292.pdf
    • https://fukuzodi.weebly.com/uploads/1/3/5/3/135329923/muwosonifuze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jedobufudajewu/21509014326.pdf
    • http://zugepoguj.onlinewebshop.net/motorola_cls1410_frequency_change.pdf
    • https://uploads.strikinglycdn.com/files/a3dcc612-594a-446c-b9ab-8615b962b745/edtpa_instruction_commentary_elementary_math.pdf
    • https://s3.amazonaws.com/wovitiku/30282150114.pdf
    • https://s3.amazonaws.com/petuzutemixuvod/25720445262.pdf
    • https://s3.amazonaws.com/kobivimelelo/fender_hot_rod_deluxe_112_enclosure_limited_edition.pdf
    • http://tepominofujemo.atwebpages.com/nulunenijimapupu.pdf
    • https://uploads.strikinglycdn.com/files/5977fef1-0bd3-42bf-bd1b-a689193402a4/66495285175.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f09b.bin
caa05fc28649c328b51f6a0863e27525ba24f82aab373e5de4245225f1975e49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF09B 5156 bytes
font_01_sfnt_off00010233.bin
d2c233e8980d4683359a98c47b9f39ec01636113098b2273bff75f68eedcebdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 10868 bytes

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