Malicious PDF — malware analysis report

Static analysis result for SHA-256 7705af3c3389615f…

MALICIOUS

PDF

60.8 KB Created: 2021-02-23 11:50:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c7b066851b017b64090ce1dd12aeb1fb SHA-1: aeb2da1510de7ce78d098208e78d76bf8a1133fc SHA-256: 7705af3c3389615f2a13f2a5b9f406599755de9c120e06cf843059e48993f73d
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to redirectors, indicating a link farm or phishing lure. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' strongly suggest this is a malicious document designed to redirect users to potentially harmful sites. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/strik?utm_term=aa.+near+me PDF link annotation
    • http://wbigs.space/pocket_arcade_story_dx_mod_apkwzc1n.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/hhheDDl/88696141982.pdfIn PDF document text
    • http://todayshop.website/nevosafawufunm0f7x.pdfIn PDF document text
    • https://cdn.sqhk.co/xewazezikufi/ghghdru/27469055440.pdfIn PDF document text
    • https://fopisurotow.weebly.com/uploads/1/3/0/8/130874034/jexubokapexejiv.pdfIn PDF document text
    • http://redirunna.xyz/839677367070zq5p.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/jhZgcj7/31843185863.pdfIn PDF document text
    • http://converstarget.ru/nikon_dx_vr_camera_chargerh9ae9.pdfIn PDF document text
    • http://islta.fun/961363979647uopn.pdfIn PDF document text
    • https://loleritukala.weebly.com/uploads/1/3/0/9/130969936/a02211894e1404.pdfIn PDF document text
    • https://dokegofixak.weebly.com/uploads/1/3/0/8/130873830/favubita_rasiteritomes.pdfIn PDF document text
    • http://doweryklkq.space/38662548761njbld.pdfIn PDF document text
    • https://jozegolufipiz.weebly.com/uploads/1/3/0/7/130776065/vafuvilira.pdfIn PDF document text
    • http://gachihyper.xyz/67598825761mse18.pdfIn PDF document text
    • http://repochka.site/60486702558hy833.pdfIn PDF document text
    • http://mangalvpodarok.ru/nazofexukexbpru1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/97325776446.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/crazy_frog_dance_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/86236365942.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/27684813691.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_off0000b356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB356 4644 bytes
SHA-256: 2c2f7ce4e1c1923cd39fb8baa2e867f22b08a4fdda249a947e867a7813dfdb18
font_01_sfnt_off0000c30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30A 10528 bytes
SHA-256: d34d39b46164a6d27c3059a356d15c0640a8341c151757317762320a58d308d7

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