Malicious PDF — malware analysis report

Static analysis result for SHA-256 94358273f5e29537…

MALICIOUS

PDF

103.7 KB Created: 2021-02-21 17:35:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8eb0864307ef0c982373a3c3d33df068 SHA-1: d16fd6f71894301cf87a90b27f03b9135be5fc12 SHA-256: 94358273f5e29537e0fe464fa824acf4f125bf45925f7e01b6e6372936478a72
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 pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=letra+himno+nacional+mexicano+completo+16+estrofas PDF link annotation
    • https://cdn.sqhk.co/vanewano/8OgfSNM/miui_10_pixel_icon_pack.pdfIn PDF document text
    • http://lnstagramcopyrightmanagement.com/basic_networking_notes_free9pvjg.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/j8Gjihh/batunugonabavojujo.pdfIn PDF document text
    • https://cdn.sqhk.co/rolidazi/XL43E9B/sememagiwukatesuwakeje.pdfIn PDF document text
    • https://cdn.sqhk.co/zazifutunoj/iifSWaT/99426357254.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/bipedyoq0u.pdfIn PDF document text
    • http://dejogemo.22web.org/how_to_become_closer_to_god.pdfIn PDF document text
    • http://khanapoorti.com/210717790347ape3.pdfIn PDF document text
    • https://binapesod.weebly.com/uploads/1/3/1/4/131438069/wejage-busobotenev-tapotepuko-nakenexejo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382420/normal_60273e0070858.pdfIn PDF document text
    • https://xuxijirabof.weebly.com/uploads/1/3/1/4/131406659/letiwenajuzifer-xevunum-setawonoguru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kebafitesulodu.epizy.com/sevebuvesunavupaxizi.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/call_of_duty_mobile_battle_royale_guide.pdfIn PDF document text
    • http://vunefukovamin.rf.gd/65125727436.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_off0001547d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1547D 5472 bytes
SHA-256: b1f2464d31595db7a87b52c8bc345a167aa660bd366c7d9981903b2b0a2c3e1a
font_01_sfnt_off00016701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16701 12396 bytes
SHA-256: d0ddececaae0608b975132bf76eb5015805e6292487584b73a1f35532577964c

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