Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d551b807feb2bea…

MALICIOUS

PDF

72.3 KB Created: 2021-05-24 10:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5a744844e5432c4676fbc1b546aa1a69 SHA-1: 7181cdf71f4ffe8717b633dd55779730f6a70339 SHA-256: 7d551b807feb2bea35dab4f24e0fffa06d772ad7daeaf12e8b46bed43bbc3332
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to PDF files hosted on file-sharing services, suggesting a link farm or phishing lure. The heuristic 'SE_ENABLE_LURE' indicates the document likely instructs the user to enable macros or editing, a common technique for malware droppers. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://nipisod.ru/strik?utm_term=excel+formula+refer+to+another+sheet PDF link annotation
    • https://giduzuzetedeze.weebly.com/uploads/1/3/4/8/134853145/9313643.pdfIn PDF document text
    • https://vurusewotuludi.weebly.com/uploads/1/3/0/7/130739344/1464837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468812/normal_603c83a188f5e.pdfIn PDF document text
    • https://jatilesaza.weebly.com/uploads/1/3/4/3/134316516/lojav_nagir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411686/normal_5fd822bed2520.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373271/normal_5fdc0cb7d0f37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448542/normal_6027594f7a9d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_5fe8acdba3d7b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1afa64d9-5924-4ce2-9925-67108e7c8448/13218469018.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/74776859696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c62e15d9-ad92-46cf-90ef-dc327eb483fe/one_with_you_sylvia_day_ending.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc0d733a-e13c-458f-b60d-c577791f1379/pidejunufemuzuk.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/obusforme_seat_support.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66eddac7-0baa-4d48-b43c-9be2895793d4/fisher_price_infant_to_toddler_rocker_pink_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30e51c7a-4046-4982-a5af-5a6ee3211ff9/how_to_find_the_distance_in_projectile_motion.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/50763588707.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_off0000dc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC78 5144 bytes
SHA-256: 3f830bb64d6e6dc9635ff4e85e5f342f7ad4ac7f8503e9d4ba1dfb2c834bf248
font_01_sfnt_off0000edd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 11180 bytes
SHA-256: 4f6a443003f61fad54eac35d5a93643509368d5e29809a3e12fceaaba8352aa0

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