Malicious PDF — malware analysis report

Static analysis result for SHA-256 8431ec94d22bbd77…

MALICIOUS

PDF

75.6 KB Created: 2020-11-24 16:47:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3c26ad5eb62f51c42192b73034ac65fe SHA-1: 92a35c01eee9baffffbcb7ce40ffdcec81bc1a26 SHA-256: 8431ec94d22bbd7736bcab0463053eb9aa851bcf8153dd15f26b12ff02d8e19a
214 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a PDF redirector link and a link farm. The presence of numerous external links, including one pointing to known malicious infrastructure, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs indicate a likely intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffine.ru/strik?utm_term=american+hunter+wildlife+feeder+manual In PDF document text
    • https://paxuxavige.weebly.com/uploads/1/3/4/3/134373921/repupifuxer.pdfIn PDF document text
    • https://tilifezazam.weebly.com/uploads/1/3/4/7/134763305/figomakefega-panamaze.pdfIn PDF document text
    • https://nudozulewofofij.weebly.com/uploads/1/3/4/7/134711849/sodigabixan-bozifaziji.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/e8631.pdfIn PDF document text
    • https://falojabuvo.weebly.com/uploads/1/3/4/7/134774067/dosozusafimusapeke.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://uploads.strikinglycdn.com/files/7aa7f116-d1cc-4b2f-acfc-f93f0727a57d/1_clue_picture_x_crossword_answers_level_53.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a26d43c-e908-43d5-aa21-d8ec303d6dbb/tunob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23ab0ce9-ab03-48fb-bb01-0e077c5cba1d/70528317882.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff3ea775-dd1a-455a-aa44-35fb088e7e85/tozakidegu.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/autodock_4._2._6_page.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b4d60d1-f5ff-4035-9041-beec2324b50a/putafidif.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_off0000dc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9C 4936 bytes
SHA-256: 11684b8c050e2c41033bdde57c2d2be95634d733c288d05a37e89401013f200b
font_01_sfnt_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 11288 bytes
SHA-256: 19919f3cd90230d6e98a189633a073c7444abb0c798a21e556912e679b78552e
font_02_sfnt_off00011367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11367 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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