Malicious PDF — malware analysis report

Static analysis result for SHA-256 56cfa2d5775ace04…

MALICIOUS

PDF

84.8 KB Created: 2021-03-27 21:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: face5e9bd3da82ac3ab9dc20d20c6ba0 SHA-1: 51d2a99d8bd0185027740f91479b97ce5c16a80f SHA-256: 56cfa2d5775ace044e36f64870446d4022c87b843680e8bcfe2d81f941afe52a
156 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 point to other PDFs, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=tcp+ip+illustrated+pdf+volume+2
    • https://cdn.sqhk.co/turanexode/ie8xFb8/zuru_x-_shot_typhoon_water_guns.pdf
    • https://cdn.sqhk.co/tilomulobet/IgdMrif/84534985516.pdf
    • https://cdn.sqhk.co/revinoxu/iihia2f/bureaucracy_management_theory.pdf
    • https://cdn.sqhk.co/sadetujadufi/7HGMwDY/gibewopajifolorameru.pdf
    • https://cdn.sqhk.co/kosojilufut/ntgigjE/62904958566.pdf
    • https://cdn.sqhk.co/melobokodijo/cujgjbs/88589509558.pdf
    • https://cdn.sqhk.co/dutebevon/fgchc9B/horizon_credit_union_macon_mo_routing_number.pdf
    • https://cdn.sqhk.co/nexetifosam/hiSVlza/stickman_ninja_2_ultimate_ninja_warrior.pdf
    • https://cdn.sqhk.co/sunomedude/hbcigia/cake_maker_story_game_apk_mod.pdf
    • https://cdn.sqhk.co/juvekuvop/bii07gi/dajawasuledino.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/fe348d07-01a3-42e9-a7f1-65d4c8f9ef56/g_shock_watches_for_mens_price.pdf
    • https://uploads.strikinglycdn.com/files/f3baa952-a18b-4c43-be0a-dc973ec79fa2/3224418108.pdf
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_493a9d5e316a447683d111d9a8dc2df8.pdf?index=true
    • https://s3.amazonaws.com/xenavuxa/91193274970.pdf
    • https://s3.amazonaws.com/sudevejerifu/pususejebawowalafexuj.pdf
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_a05ad0a480ef40b5843bbb8dae64c398.pdf?index=true
    • https://s3.amazonaws.com/rejiner/zegibozuvibugonupipo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101f7.bin
3ae3259bfd7a6ad31bd9f79774ab318a45210e50927e865e2f84aca73d3c25b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101F7 5216 bytes
font_01_sfnt_off000113ba.bin
eecfdb7f6acd955d092cdbe3a6fd7de5afb8c2865449e7ee38c676ea7f685854		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113BA 11016 bytes
font_02_sfnt_off00013853.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13853 4324 bytes

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