Malicious PDF — malware analysis report

Static analysis result for SHA-256 e639450f375669ef…

MALICIOUS

PDF

74.3 KB Created: 2021-02-07 03:45:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f96095e10975dea9caf7e360c8149f55 SHA-1: a29654b523fabe31873686ab7be7bf81ca2f110a SHA-256: e639450f375669efdb09cb468240a7f4c1047536632ef217321d446056405c36
214 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to external websites, many of which are part of a link farm designed to manipulate search engine results. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wb?keyword=causes%20of%20absenteeism%20in%20workplace%20pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4389821/normal_5ffb2a7f6288a.pdfIn PDF document text
    • https://wamabiror.weebly.com/uploads/1/3/1/1/131163705/3987773.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377410/normal_5fe14053a1193.pdfIn PDF document text
    • https://cdn.sqhk.co/rabovafom/fjhg8Av/43616311412.pdfIn PDF document text
    • https://jevamupoledi.weebly.com/uploads/1/3/4/7/134712268/5476503.pdfIn PDF document text
    • https://texoxarisozitew.weebly.com/uploads/1/3/0/9/130969357/kinawamozikuwosis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483354/normal_600400da24e25.pdfIn PDF document text
    • https://balikawe.weebly.com/uploads/1/3/4/6/134659528/0da3b923.pdfIn PDF document text
    • https://cdn.sqhk.co/vajegipofuz/2gja1hd/fusoxutabig.pdfIn PDF document text
    • https://cdn.sqhk.co/vilomikov/t13iggg/nifuwodigumotipulodabupej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wetedezowob.rf.gd/almost_adults_subtitles.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/basalt_formation_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/metal_casting_process_video_free.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/pezusuro.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/firefox_64_bit_english.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/latest_version_of_gb_whatsapp.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_off0000e6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B6 5500 bytes
SHA-256: 29e41818f0c48e6e35a1e95368d631402d408ddfdcb7e10683473f6b96484574
font_01_sfnt_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 10320 bytes
SHA-256: 25ed274f1be1305fb97a2c80cdfadccb515ba7918434df05f38163bfc50b9408

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