Malicious PDF — malware analysis report

Static analysis result for SHA-256 239ffbbf4f3b452c…

MALICIOUS

PDF

81.2 KB Created: 2021-05-22 01:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 66c850313e67f4433ac7b86adb58dc73 SHA-1: 2edfb47899ab3f6f43fffb16df5bbe59f02284ba SHA-256: 239ffbbf4f3b452c8aadd6a9fa0ae6d06a87102a2c860d34d2ce0b1dd5610fe0
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The embedded URLs, such as 'https://soxebez.ru/strik?utm_term=how+to+use+a+bartender+kit', are likely used to redirect users to malicious sites or phishing pages. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://soxebez.ru/strik?utm_term=how+to+use+a+bartender+kit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459035/normal_6006e425330c3.pdfIn PDF document text
    • https://daxatuvumuna.weebly.com/uploads/1/3/4/8/134863787/kotixama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390684/normal_5fe9a8cfb92e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390056/normal_604d142fcb079.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499300/normal_604cd0b487f3e.pdfIn PDF document text
    • https://rasisepuwefu.weebly.com/uploads/1/3/4/6/134678142/b5bfd5d8f.pdfIn PDF document text
    • https://dotejapu.weebly.com/uploads/1/3/4/0/134042906/mitigotu.pdfIn PDF document text
    • https://lodikesilir.weebly.com/uploads/1/3/4/8/134868057/6673621.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468571/normal_5fc74f07b6e2e.pdfIn PDF document text
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/miniridotu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445130/normal_5fe3e521dbcec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418985/normal_5fce9c7be20ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445324/normal_60344fc3a8a38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421468/normal_603ddf1bee639.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392199/normal_5fde2afb3e11a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482418/normal_5feb23ce22788.pdfIn PDF document text
    • https://sugovodeko.weebly.com/uploads/1/3/2/6/132681033/9c561.pdfIn PDF document text
    • https://mapulanedubo.weebly.com/uploads/1/3/0/9/130969056/dorabafolosas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sezebepit/sears_appliance_repair_service_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/app_store_mac_os_x_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/48048105165.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/2673885517.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/2012_toyota_camry_hybrid_repair_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36D 4928 bytes
SHA-256: dad0bccbfdd9a173d593e2d3815d0f0e33e0dd262a1eb424a3474bd5bb83ec10
font_01_sfnt_off00010444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10444 10744 bytes
SHA-256: a6ca52739649928fd34acc3b86a9a6382d2c6696f06136d5b706a42023382e47
font_02_sfnt_off000128bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BD 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c