Malicious PDF — malware analysis report

Static analysis result for SHA-256 911c00b3fdf0be5b…

MALICIOUS

PDF

66.0 KB Created: 2021-01-11 12:03:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c94c0f27a3ea967b4a2b269d92a5f2a7 SHA-1: 584e9f1ea8ae035b9b3d8c489ecbc9bec4a46080 SHA-256: 911c00b3fdf0be5b6d90d8733fc20366d94e7a49935418ff147c301bedef8cd0
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier, containing numerous embedded links. Several of these links point to known malicious redirectors or are part of a link farm hosted on disposable infrastructure, suggesting an attempt to lure users to malicious websites for phishing or SEO spam. The document body itself is heavily obfuscated and contains garbled text, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/123?utm_term=where+is+310+area+code+in+florida In PDF document text
    • https://site-1178504.mozfiles.com/files/1178504/kupokojumanuxofaxu.pdfIn PDF document text
    • https://site-1246938.mozfiles.com/files/1246938/9450670764.pdfIn PDF document text
    • https://site-1168371.mozfiles.com/files/1168371/69230976196.pdfIn PDF document text
    • https://cdn.sqhk.co/wodaximewule/RGjegdZ/5211435493.pdfIn PDF document text
    • https://duzuvopewawufos.weebly.com/uploads/1/3/4/4/134491429/nuwajoxani.pdfIn PDF document text
    • https://site-1196780.mozfiles.com/files/1196780/10576378061.pdfIn PDF document text
    • https://rurevudo.weebly.com/uploads/1/3/4/2/134265418/6226285.pdfIn PDF document text
    • https://site-1180908.mozfiles.com/files/1180908/dune_hd_remote_control_ios.pdfIn PDF document text
    • https://dejamemetegabov.weebly.com/uploads/1/3/1/8/131856029/6899393.pdfIn PDF document text
    • https://pezujotage.weebly.com/uploads/1/3/4/3/134318684/kunabodebe.pdfIn PDF document text
    • https://site-1204816.mozfiles.com/files/1204816/sifegudufisidofuxu.pdfIn PDF document text
    • https://pojozuwowate.weebly.com/uploads/1/3/4/6/134631913/vimaroxu-safojujarimoja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376858/normal_5fe5f0ed573b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61A 5480 bytes
SHA-256: 391b562fedab55bbd4f76a88ec76a317960a60494141f480bfef490c26470687
font_01_sfnt_off0000d8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CC 10184 bytes
SHA-256: 7eb19132e5d1b29811cbd19a9a2b085cb5a32de17eaa31208d11db3d4512778e

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