Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a4b738d4bd4541…

MALICIOUS

PDF

96.9 KB Created: 2021-05-02 07:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b636d6913fd5de1e6f1e569baec2215c SHA-1: 79e4fae671e4228e5859b67fddd3790506c101d5 SHA-256: 35a4b738d4bd4541969f81634269873af52ff3a2e6d781caaa60952b048f7ed4
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 are SEO-optimized and point to other PDF documents, suggesting a link farm or SEO poisoning attempt. One prominent link redirects to 'https://jumiwimov.ru/strik?utm_term=tippmann+98+custom+pro+manual+pdf', which is flagged as suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=tippmann+98+custom+pro+manual+pdf
    • https://kikobuvikivevir.weebly.com/uploads/1/3/1/4/131437815/8b2a05eb9efba0d.pdf
    • https://cdn-cms.f-static.net/uploads/4388046/normal_6026aa647c787.pdf
    • https://cdn-cms.f-static.net/uploads/4481830/normal_6035fe0f5805e.pdf
    • https://kunudixi.weebly.com/uploads/1/3/4/6/134667289/voxazoxujixuji.pdf
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/484191383398.pdf
    • https://cdn-cms.f-static.net/uploads/4416143/normal_600ed62bd8f97.pdf
    • https://zetovesejideze.weebly.com/uploads/1/3/1/4/131482946/muzabukaxix.pdf
    • https://cdn-cms.f-static.net/uploads/4416125/normal_603367993ad30.pdf
    • https://static.s123-cdn-static.com/uploads/4470540/normal_600822228684d.pdf
    • https://cdn-cms.f-static.net/uploads/4487423/normal_60607c12d763b.pdf
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/7c37ab43b543d4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_71dfde45f74b48078ec8b3cab9c007ac.pdf?index=true
    • https://s3.amazonaws.com/wujixus/el_lazarillo_de_tormes_editorial_anaya_clasicos_a_medida.pdf
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_d5115c1b917946c786da2f050cf34735.pdf?index=true
    • https://s3.amazonaws.com/zerejibixupav/lafapevinokoz.pdf
    • https://6ba7316d-b84b-4ccb-a32a-103c856d4013.filesusr.com/ugd/91f37e_9599e1b9cd5a4e9fa1fe888f7a260c3a.pdf?index=true
    • https://s3.amazonaws.com/tutapaxi/scroll_template_word.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013d4f.bin
1af34a08ba1ea223581fac9e3c99d64dfd5eea60a0cf4429f7b151584246b9c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4F 5600 bytes
font_01_sfnt_off00015039.bin
c082cb6b5939da07e0387c48adc636b16ef7df0f0892cfa5cb2a2a8b2fb9e35b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15039 11472 bytes

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