Malicious PDF — malware analysis report

Static analysis result for SHA-256 4895a4b39bc2bacd…

MALICIOUS

PDF

73.3 KB Created: 2021-01-06 06:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 477ec66ba86ce5da2e437f7c4c720a1a SHA-1: 9713394a503e343a841ab999ac38bf3a0962e357 SHA-256: 4895a4b39bc2bacd80b3ba091b30c38dc9b282feaa16851c55a5a96dedac34ac
252 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to disposable hosting and redirector infrastructure, indicating a link farm designed for malicious purposes. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a 'download button' lure and the overall structure suggest an attempt to trick the user into navigating to malicious sites, likely to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/aws?utm_term=brother+status+monitor+application In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377717/normal_5fb8b50729853.pdfIn PDF document text
    • https://cdn.sqhk.co/kakumipoman/jhsPb76/wyze_camera_amazon_canada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382629/normal_5fab59fe2b976.pdfIn PDF document text
    • https://nurigefisigutip.weebly.com/uploads/1/3/4/6/134628418/9504a129809ce7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421466/normal_5fa7cb1275f4b.pdfIn PDF document text
    • https://vureduvo.weebly.com/uploads/1/3/4/5/134513064/jureduge.pdfIn PDF document text
    • https://sijaxidav.weebly.com/uploads/1/3/4/4/134499987/kilosaxuzavag_vepafemoruje_rerabi_sidekeredi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494673/normal_5fbb81d5b57c1.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/vhggdjd/rokaneg.pdfIn PDF document text
    • https://lapaluletegole.weebly.com/uploads/1/3/4/6/134679291/772f70.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/bb5ef552-fd02-4272-ac82-ee1dcfd72c0f/harbor_breeze_manual_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/leluv_maxi_pump_with_gauge.pdfIn PDF document text
    • https://s3.amazonaws.com/sabobenuwe/ibm_algo_financial_modeler.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_off0000e0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 5224 bytes
SHA-256: 1bf79b69f480927201d18a4b006dc04b5683f19873a20205644efd1d4d7c0b4b
font_01_sfnt_off0000f284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF284 11104 bytes
SHA-256: 267568fc7fefea3d80558027523dcba616e53c99c8caa4cca09353bc91890c01

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