Malicious PDF — malware analysis report

Static analysis result for SHA-256 576c47e7b7b94052…

MALICIOUS

PDF

76.2 KB Created: 2021-05-25 10:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 42409e43381f4a628afd31ba5563c9c8 SHA-1: c1cb79f7a447b9340b3ee5e3805394fb3e1f7e87 SHA-256: 576c47e7b7b94052cdc9b4398cc1a8ef7302fdb82805dd75578d47ce377ed0aa
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and known malicious redirectors. The primary purpose appears to be directing users to potentially harmful external sites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://yafferge.ru/wb?keyword=where%20are%20mackie%20products%20made In PDF document text
    • https://fugejifok.weebly.com/uploads/1/3/4/1/134132056/4747e832607.pdfIn PDF document text
    • https://telazeraba.weebly.com/uploads/1/3/4/7/134771299/giwutafovo.pdfIn PDF document text
    • https://gokavebaraxev.weebly.com/uploads/1/3/5/3/135309677/3286961.pdfIn PDF document text
    • https://surevasod.weebly.com/uploads/1/3/1/8/131856145/64a758ca79994.pdfIn PDF document text
    • https://zefinefan.weebly.com/uploads/1/3/2/8/132816158/8576407.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412899/normal_605be484021cc.pdfIn PDF document text
    • https://wovebisaji.weebly.com/uploads/1/3/4/6/134687394/worufiwagefip-noxipa.pdfIn PDF document text
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/wamawara_jasebejib_wikomane.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415950/normal_5ffdb9b68f900.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486034/normal_5fee1fec6d8bc.pdfIn PDF document text
    • https://rigukolanerimi.weebly.com/uploads/1/3/4/5/134519373/942202a500.pdfIn PDF document text
    • https://tupusedaluniji.weebly.com/uploads/1/3/0/7/130738871/5686771.pdfIn PDF document text
    • https://kapelivoxiri.weebly.com/uploads/1/3/4/0/134040857/vovuvifajeb.pdfIn PDF document text
    • https://kazowutulegopos.weebly.com/uploads/1/3/5/3/135324393/2227568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486213/normal_6015b682639eb.pdfIn PDF document text
    • https://nimukebobe.weebly.com/uploads/1/3/4/5/134527887/3856265.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2245f6af-af49-4345-abd0-0df8dbae65a6/mens_blue_dress_shoes_outfit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/525a5fae-3844-427b-b22b-cc2558f2bca8/433902909.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/how_to_check_null_in_dataframe_python.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/vebolataneruxunarelil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc053ef9-bc86-4835-8d99-f1e0f56c6cd3/55381367362.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_off0000ec1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 5356 bytes
SHA-256: cb437309a0f12669c1c2ece25e2ed515833b23f1390605fee2a904a0753d147c
font_01_sfnt_off0000fe36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE36 10556 bytes
SHA-256: a50661cdbdec64aeb1051e36b95997bbfb300fdf274edf78d5c1e928e887359c