Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cdc3313fdce08aa…

MALICIOUS

PDF

70.3 KB Created: 2020-12-21 04:55:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5b0a40f00de049194bd4835339a83150 SHA-1: 7b4865b697567365240266ba4ceb406a399b775f SHA-256: 1cdc3313fdce08aad0d7905fd8e6f177b210c596e3199f3d3816b9d7fa1935bb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to disposable domains and Weebly-hosted files, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, suggests a 'worksheet answers' theme to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://trafffe.ru/aws?utm_term=figurative+language+worksheet+9+answers PDF link annotation
    • https://rizadubarezesul.weebly.com/uploads/1/3/4/4/134499036/4872483.pdfIn PDF document text
    • https://kojovade.weebly.com/uploads/1/3/4/6/134681743/e2dfab347611646.pdfIn PDF document text
    • https://resodafuwagolip.weebly.com/uploads/1/3/4/3/134313475/7218109.pdfIn PDF document text
    • https://bebejumupetokox.weebly.com/uploads/1/3/4/5/134513190/wovuzavibaxerin.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/natozasajerizow-kidatub-fisemanumutid-rajebodelovisaj.pdfIn PDF document text
    • https://voletiga.weebly.com/uploads/1/3/4/5/134501602/2880368.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/timeziso/rodudadupafapopazuk.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/everyday_edit_autumn_fun_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/33746682463.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/angel_season_4_episode_11.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/blaze_and_the_monster_machines_games.pdfIn PDF document text
    • https://s3.amazonaws.com/suzitivasekoga/damusa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc57c6e085bf90c0e1c1b48/t/5fc9d9089c93c058c4862e96/1607063817051/fupasige.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62B 5156 bytes
SHA-256: c870331f773dbf602c36ccab521b93eb3b40cd735549539df1ac9d007ab69fa5
font_01_sfnt_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 11124 bytes
SHA-256: e748145bd544f761c4685926741561e64fc6b01ce4d53223d2ee236bbc0100af
font_02_sfnt_off0000fc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8E 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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