Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e66b954bfa39526…

MALICIOUS

PDF

121.7 KB Created: 2021-02-12 21:53:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 21c39d98902c35c0493b60cf619a8f46 SHA-1: c8d4e5400fb013f3aaa9375fea1d9ee04d434372 SHA-256: 5e66b954bfa39526c6f3ae5955bdcb6ae41fa12cc6448dd2a3b83a73c3f4aca9
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links, with at least one directly pointing to known malicious redirector infrastructure. The presence of many PDF links suggests an attempt to distribute further malicious content or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • 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://crophysi.ru/123?utm_term=pathfinder+shaman+spirit+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384851/normal_6017615758daa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413121/normal_600c390628206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483070/normal_5fd3b2fb007b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413345/normal_5fec905ce9068.pdfIn PDF document text
    • https://nafipitomaw.weebly.com/uploads/1/3/5/3/135349771/1816413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483359/normal_60188702891c6.pdfIn PDF document text
    • http://slamelina.website/falomevefuwavovenibezootinc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424981/normal_60200698e2e8f.pdfIn PDF document text
    • https://dawokopo.weebly.com/uploads/1/3/5/3/135314789/wujapexugidat.pdfIn PDF document text
    • http://boothattendant.com/mazumijidpo4g.pdfIn PDF document text
    • https://nidikibadut.weebly.com/uploads/1/3/1/4/131453007/1678367.pdfIn PDF document text
    • https://popogupu.weebly.com/uploads/1/3/1/3/131398113/1359290.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nebokidib.epizy.com/dakegosaxewubipejizizu.pdfIn PDF document text
    • http://gorefoverotiw.epizy.com/hirayama_autoclave_hg80_manual.pdfIn PDF document text
    • http://bipibalixezesat.epizy.com/zapezaluvedenix.pdfIn PDF document text
    • http://gexazavere.epizy.com/gazikepebobana.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_off0001a3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3A1 5424 bytes
SHA-256: c9489c5701aaf58e2850c872c4de394a24717960d8911a42d728f1b8a9889bb2
font_01_sfnt_off0001b5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5F0 10548 bytes
SHA-256: d59e9531cccfc5821f98b0fdd956e6aaa53966e37560cafb77543f8dfb501c10

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