Malicious PDF — malware analysis report

Static analysis result for SHA-256 271f455620ac0eb3…

MALICIOUS

PDF

66.4 KB Created: 2020-12-04 15:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 566aa2d99501aff420889785ac990d7f SHA-1: 6783b14a45707909782e8cd83368d4a172f1f49b SHA-256: 271f455620ac0eb32075517b444c1dca267c597b715f80bb1189ea5e2476cf9c
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains a large number of external links, many of which are to PDF files, suggesting a link farm or phishing attempt. One of the primary URLs points to a site that appears to be related to search engine optimization keywords, further supporting a lure-based attack. No scripts were extracted, but the PDF structure and heuristics indicate malicious intent.

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
  • 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.
  • 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://trafffe.ru/wb?keyword=integers%20mixed%20operations%20worksheet%20pdf PDF link annotation
    • https://bomaripuxizidul.weebly.com/uploads/1/3/4/9/134901287/golugasevewipi-gudirinipukeke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416935/normal_5fb35488164e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374954/normal_5fb4034b46971.pdfIn PDF document text
    • https://vizakadaji.weebly.com/uploads/1/3/4/4/134491897/9358615.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366666/normal_5f8731179640b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5f883a65180ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0e734ec917750a3d7e8d7/t/5fca388b2ae1264a039c84f8/1607088268380/kingdom_hearts_fruit_quote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7274b713-afc6-4996-a82b-3fdeef54e916/40725389904.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10aaaf9866f3fd2d521c0/t/5fc198cdf3de5e49b5a0f3b7/1606523085959/94558546859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75d99e48-164c-4c8d-9e9c-f6c0b174e859/zoxusomibekijufununigonej.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6fa32a4492a057e20be12/t/5fc7abf80791337046ed38f0/1606921209759/life_is_strange_2_trophy_guide_episode_1.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2c2dc1452f90b7ff143cf/t/5fc3e92a08845d092402018d/1606674731054/notejosowalikupo.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_off0000c54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54A 5584 bytes
SHA-256: a2c98bc67b1ec2b34d1e35fde85d5ceb90bc4a69a63fc03aff6e9f9555979783
font_01_sfnt_off0000d839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 10636 bytes
SHA-256: 9d44c32f0d95221d904e9682aa16984e0e5b2a16b5075c0db1251b15447d4500

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