Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a0271abc8f094f…

MALICIOUS

PDF

79.1 KB Created: 2021-04-05 01:11:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 885d52bfa359fb9de4fc7d038fe05bb1 SHA-1: 52fde7ff333b4482d81d11d237395e863ff060ca SHA-256: b1a0271abc8f094f6a1dcce7de89a245bc0483d3c1e3f14b5384acac28c2af98
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to research projects, likely intended to trick users into visiting a malicious URL for credential harvesting or malware delivery. No scripts were extracted, but the overall structure and URL distribution strongly indicate a phishing attack.

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://gimoguvi.ru/award?keyword=acknowledgement+for+research+project+pdf PDF link annotation
    • http://pebunoguge.mygamesonline.org/41813991333.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456687/normal_5ff5b7c46ea46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378167/normal_603cc48157076.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/adding_improper_fractions_with_like_denominators_worksheetsts1qh.pdfIn PDF document text
    • http://goproonly.com/how_to_train_your_dragon_12_books_collection_set_by_cressida_cowellwm84s.pdfIn PDF document text
    • http://gukivuzijisuva.getenjoyment.net/nafenifokazu.pdfIn PDF document text
    • http://govnosiakxws.online/278074875555boge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457005/normal_5fce23fba68af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445731/normal_5fcf61c8ecb5c.pdfIn PDF document text
    • http://lidzadva.xyz/57720114507abv8q.pdfIn PDF document text
    • http://iciapp.xyz/cules_son_los_sntomas_de_un_cncer_de_pncreassqwin.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://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_242c85bd07034651840151c3fc7c0245.pdf?index=trueIn PDF document text
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_960227c6aabc4a03bc6035d5420ff49d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/telugu_movies_in_tamilrockers_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/how_to_practice_for_dmv_permit_test.pdfIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_846ba3700de74fce8d186ecc4483389c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widetunipet/dofadaduxo.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/seburidarudewurudelez.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/20579453676.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_off0000e9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EA 5528 bytes
SHA-256: 0c5856e9204d71f6336e2f048ec36ed3210c669f0434e5dbc3c2f4aa19604285
font_01_sfnt_off0000fca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA4 10564 bytes
SHA-256: afa1f4308ec8b5d28e92e3af2fc60ba7e13cd0b50915a89c968d772efab6a64c
font_02_sfnt_off000120a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A3 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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