Malicious PDF — malware analysis report

Static analysis result for SHA-256 a72b5daa6d4456c6…

MALICIOUS

PDF

64.2 KB Created: 2021-01-04 23:45:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 950ecd98fa8b75ebeb7ab9f279108504 SHA-1: 7f6ee27ef597f8bd07be3cd1baad30c475b139f3 SHA-256: a72b5daa6d4456c65f228f0e91b0ace0755abae617da0516f3dd58324e8dbfae
214 Risk Score

Malware Insights

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

The PDF document contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to watching a movie online for free. The presence of numerous external links, including a link farm, further supports a malicious intent, likely to redirect users to phishing or malware distribution sites. The ML classifier and ClamAV detection strongly indicate maliciousness.

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://ggtraff.ru/123?utm_term=watch+the+great+gatsby+online+free In PDF document text
    • https://static.s123-cdn-static.com/uploads/4403539/normal_5fee98025b8b2.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/icVggjb/cookies_must_die_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502920/normal_5fe9172edd734.pdfIn PDF document text
    • https://xigokerurubupa.weebly.com/uploads/1/3/4/3/134312623/sagelejavumizo.pdfIn PDF document text
    • https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/022addff4f7fa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f956b7683bba.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/if6jggc/xipofe.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/mesotodimus/59747167004.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/fujalafiwiwaxikun.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/xinozufojuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c61d7166-1d99-4930-be38-a63d149888d1/raid_hq_hack_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/40979585560.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/saguwugodozexixutifujaf.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_off0000baec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEC 5400 bytes
SHA-256: 6634421942f21ddb88c919eba6a2f9a0381f4247dd409995662062786ea1fd53
font_01_sfnt_off0000cd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5B 11296 bytes
SHA-256: c53db3d085772501497c1c8a5dce6ebaf88456e006983beca8ad30d9b4aa560b

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