Malicious PDF — malware analysis report

Static analysis result for SHA-256 4baacc11c60bb612…

MALICIOUS

PDF

69.0 KB Created: 2021-01-05 19:45:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 382ed4210db6c4c502620ccb2b81afaf SHA-1: 99ab86f74dcf0589dba8b6640f9eca89a1d92f04 SHA-256: 4baacc11c60bb61204b5c003e69bfac2d80d796967a56d1204b4ecd6c14cd3f1
294 Risk Score

Malware Insights

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

This PDF file is flagged as malicious by multiple heuristics and a machine learning classifier. It contains links to known malicious redirector infrastructure and a large number of links to other PDFs, suggesting a link farm or distribution network. Crucially, it instructs the user to disable security software and use clipboard commands, indicating an attempt to facilitate the execution of a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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/123?utm_term=unimac+error+code+34 In PDF document text
    • https://fijakesu.weebly.com/uploads/1/3/4/5/134527503/volokik-sizul.pdfIn PDF document text
    • https://cdn.sqhk.co/nejajevafode/oggje9K/english_grammar_lessons_free_online.pdfIn PDF document text
    • https://fomujozi.weebly.com/uploads/1/3/4/0/134016754/8584780.pdfIn PDF document text
    • https://weropejo.weebly.com/uploads/1/3/4/3/134321986/e51aee2e6.pdfIn PDF document text
    • https://dujewukemapaf.weebly.com/uploads/1/3/1/4/131453220/wofemudavupezorarid.pdfIn PDF document text
    • https://gakuzelidojipo.weebly.com/uploads/1/3/4/3/134395763/mazaxadem_xoluzedikunixur_zimapovuguzi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464870/normal_5feb25e35fd48.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/perurulexi/harvest_moon_a_wonderful_life_lumina_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/midewarexatus.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/pakerep.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/permutatio_thaumcraft_6.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/escalation_protocol_weapons.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_off0000d237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD237 5116 bytes
SHA-256: e225dbf6889b9b0233a1298a696c023668b0b923b304fcfbc37df3e2ade2a183
font_01_sfnt_off0000e390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE390 10892 bytes
SHA-256: b3fd454d431740c4427bbdedb81c2e8921d259595cba6b07d17a042f41f09dd2

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