Malicious PDF — malware analysis report

Static analysis result for SHA-256 19239f48775b3218…

MALICIOUS

PDF

73.9 KB Created: 2020-12-21 20:54:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61ba9a90cd2a8c41eaa0b9813a824abd SHA-1: 142e8f642496fc56b255180f7460dcc37bb907ea SHA-256: 19239f48775b3218d792604c83d1d7d58d1e91bc7c0e49cefad013e58b1165d3
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm likely used for SEO manipulation or to distribute malicious content. The presence of a link to a known malicious redirector further supports this. ClamAV and ML classifiers also flagged this PDF as malicious, suggesting it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.
  • 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://ggtraff.ru/strik?utm_term=electric+furnace+energy+cost+calculator
    • https://zetizisoxaw.weebly.com/uploads/1/3/4/4/134498522/vutizepu.pdf
    • https://static.s123-cdn-static.com/uploads/4380078/normal_5fcce2763e505.pdf
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/4572181.pdf
    • https://veximukexapi.weebly.com/uploads/1/3/0/9/130969798/397b7837d944.pdf
    • https://cdn-cms.f-static.net/uploads/4374002/normal_5f8979ce00179.pdf
    • https://cdn-cms.f-static.net/uploads/4421474/normal_5faac9dcdf55a.pdf
    • https://wujibinofowe.weebly.com/uploads/1/3/1/3/131383737/c276d.pdf
    • https://kirugivedipabaw.weebly.com/uploads/1/3/4/4/134464293/bujimonipa-wobusup.pdf
    • https://cdn-cms.f-static.net/uploads/4383801/normal_5fbaa3f93d833.pdf
    • https://sivubatololux.weebly.com/uploads/1/3/4/8/134850937/7458018.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc106fbd49dd1244734cdd3/t/5fc748210623334b0c5d7f6f/1606895651893/final_fantasy_iii_ds_rom.pdf
    • https://uploads.strikinglycdn.com/files/4ab959aa-604d-41b8-9c75-51d98f2e2665/google_sheets_reminders.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_off0000e322.bin
80641684243605466fa32f750088c66b3ffd20704a36a9a976ec04d2c71413a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE322 5108 bytes
font_01_sfnt_off0000f4a6.bin
714e9cecdddebfca5db5e3a7311523d3601b10a5ea7e985172c77b7f4d166c49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 11104 bytes

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