Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd0098134ab1efd…

MALICIOUS

PDF

71.6 KB Created: 2021-01-13 22:35:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b25cc20f8691e768c96871b87c9471f2 SHA-1: 9326b4ad63d5fceecf6ceb68b35185c1f826f499 SHA-256: fdd0098134ab1efd6e898216b409c950a575faa0ba6f102333a266bcc702e9b3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a large number of external links, including those on disposable hosting, suggests a link farm designed to redirect users to potentially harmful sites. The document's content, though heavily obfuscated, appears to be a lure related to 'Harmony public schools calendar', likely a pretext for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffking.ru/123?utm_term=harmony+public+schools+calendar PDF link annotation
    • https://cdn.sqhk.co/bimeniwog/hciagcd/21835424674.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416659/normal_5fed92ba0c514.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426830/normal_5ff6d5d33b8a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378382/normal_5f8f50478b4bd.pdfIn PDF document text
    • https://lujadogube.weebly.com/uploads/1/3/4/5/134522393/tujusav-jazenatij-bolag.pdfIn PDF document text
    • https://jugurapofan.weebly.com/uploads/1/3/4/3/134339640/toxiximan.pdfIn PDF document text
    • https://cdn.sqhk.co/fetadupozo/jjijhrn/grand_californian_hotel_direct_phone_number.pdfIn PDF document text
    • https://gimuloge.weebly.com/uploads/1/3/0/7/130775506/965ad9.pdfIn PDF document text
    • https://site-1176575.mozfiles.com/files/1176575/excel_sheet_with_data.pdfIn PDF document text
    • https://nikokabiliru.weebly.com/uploads/1/3/1/4/131409463/529602685798.pdfIn PDF document text
    • https://surudebed.weebly.com/uploads/1/3/4/5/134513173/c92c80.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/bejokazemur/75555267774.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC57 5516 bytes
SHA-256: 5a303cc8f7cd40a038ecd94df092e147540315e41fb2c257be27c652930132f3
font_01_sfnt_off0000eee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 10116 bytes
SHA-256: e75b29b024ff6d794cba830df427a009143abe5a04f441fb75712309f5f1fa00

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