Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd3b7c75dc9a634…

MALICIOUS

PDF

74.1 KB Created: 2021-04-05 13:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: bb6532058f8914c5679625c59f928708 SHA-1: 55c5b59fe824a0cfe8b9da46c1ee3231aa06388d SHA-256: fbd3b7c75dc9a6341a0deab4bf5c8012c7b0cbc5fcf8f332c4b903b06fb0af78
126 Risk Score

Malware Insights

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

The PDF file contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, suggests a lure related to educational material, which is a common tactic for phishing campaigns. The presence of embedded URLs indicates an attempt to redirect the user to potentially malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=wordly+wise+3000+book+9+review+for+lessons+5-8+answers PDF link annotation
    • https://cdn.sqhk.co/zewulutaj/heihMpY/zunixusazijamivotaxosix.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/biduzixelaxosekevabegore.pdfIn PDF document text
    • https://cdn.sqhk.co/pozusonitid/zZlic9u/21443778732.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/4qzkid9/53061433653.pdfIn PDF document text
    • http://favunewesazut.sportsontheweb.net/phantom_bangla_comics_download.pdfIn PDF document text
    • http://gegebafebofad.scienceontheweb.net/50835492054.pdfIn PDF document text
    • https://cdn.sqhk.co/fugutexifi/f6hgWen/birds_vs_zombies_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410962/normal_5fdc4f0358bc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427079/normal_605678c2416f0.pdfIn PDF document text
    • https://cdn.sqhk.co/dasotipamu/icjfYPp/kromek_group_plc_annual_report.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480403/normal_600136fd3134c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484995/normal_6052d287b441b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445557/normal_605faa0e1e754.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/gizonukorad/formal_pant_design_for_ladies.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/who_is_the_finest_in_nigeria.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/wamujotegumesar.pdfIn PDF document text
    • http://dapilejebuvone.atwebpages.com/contrato_de_auditoria_fiscal.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_off0000e011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE011 6184 bytes
SHA-256: c3addd5d669853f81e55804fd69d6df0a1ab0fb2997e0fc94163954195588737
font_01_sfnt_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 11332 bytes
SHA-256: a6529341e79c6428078a16aee534b325794d996fdda5229ffc4f567351c3fc95

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