Malicious PDF — malware analysis report

Static analysis result for SHA-256 921be337f369974a…

MALICIOUS

PDF

100.3 KB Created: 2020-12-29 23:59:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c4f469fb228e6626b3dc7d4c2af8afab SHA-1: d2463691367d14d4fcbf849336203dfd11fd0273 SHA-256: 921be337f369974a27e66f3f476771ab7223167ad4b739ba796c8b8486bdc77f
196 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, many of which point to SEO redirectors designed to obscure the final malicious destination. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK indicate a large number of links intended to manipulate search engine results and lure users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafficel.ru/strik?utm_term=slot+machine+repair+denver PDF link annotation
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/6455535.pdfIn PDF document text
    • https://cdn.sqhk.co/pimibopugugo/11wRBjg/42789183894.pdfIn PDF document text
    • https://cdn.sqhk.co/pemofirojez/gjhbihp/folasazofetuvinibegaxuluf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489596/normal_5fc10a931a129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469847/normal_5fa4d9abcc0ef.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/phjiijb/horse_coloring_book_3ds.pdfIn PDF document text
    • https://cdn.sqhk.co/wuluzajiroz/hiihghc/gagevumel.pdfIn PDF document text
    • https://kezobonuduwu.weebly.com/uploads/1/3/4/4/134457579/9867f2ab1a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kumasala/baixar_para_android_4._0.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/the_spoils_system_definition_us_history.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/kingdom_hearts_ps4_trophy_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/324221fb-246d-44be-9040-52696551547f/eso_master_crafting_writs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cab7ba1c-654d-40ce-b8cd-ebdcbfd5edc6/palette_of_narmer_material.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14149 5084 bytes
SHA-256: a2e278c64e5e6d9ee6528fc2ffb5584959c00a4b463cd992fd55e31615b25066
font_01_sfnt_off0001525c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1525C 10484 bytes
SHA-256: 9466b2fbf7f2f359ec9d4dafd4b29998ff875ef55cd63e3821fbac4154c8e257
font_02_sfnt_off0001762f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1762F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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