Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5cfde4eb9f77c5e…

MALICIOUS

PDF

82.5 KB Created: 2021-04-06 17:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ba79583ab4aa1b6568e2b85953ed3675 SHA-1: 3c5f564dc97e068e32e6a180cfa217e56cf32296 SHA-256: b5cfde4eb9f77c5ec4b9eb4f0bc5d82c0590b477abc5015bda1352e7b097081d
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/123?utm_term=tinkerbell+movies+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496225/normal_6025e423399c3.pdfIn PDF document text
    • http://guitar.su/63826077448zcl1b.pdfIn PDF document text
    • https://sobomevoza.weebly.com/uploads/1/3/0/7/130739746/a9d6d335cd.pdfIn PDF document text
    • http://baffer-shop.space/49438564371ysusg.pdfIn PDF document text
    • http://vekvelo.ru/ge_spectra_range_replacement_partsgvc74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492588/normal_602d05a27a2eb.pdfIn PDF document text
    • http://irisca.online/21395370760xekvy.pdfIn PDF document text
    • http://taher-tcac.com/odyssey_traktor_s4_caseipt0f.pdfIn PDF document text
    • https://jagotizepevex.weebly.com/uploads/1/3/4/4/134464701/4159987.pdfIn PDF document text
    • http://alkim.xyz/hampton_bay_universal_ceiling_fan_remote_control_kitix0kd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366406/normal_5ffc0bcf6af28.pdfIn PDF document text
    • http://sparzha.club/86253510541tpywm.pdfIn PDF document text
    • http://spainsale.pro/wonderlic_practice_test_questions_and_answerspzsnp.pdfIn PDF document text
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/b03bffea4a02b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474998/normal_606991e1c73ec.pdfIn PDF document text
    • http://goldstein.capital/6556057972004a7k.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/gupawupigawono/new_bhojpuri_movie_sangharsh_2019.pdfIn PDF document text
    • https://b634734f-67aa-4edc-9b69-dcf7610e4690.filesusr.com/ugd/c86859_44810f8a297742559f41c5ea42fe9d20.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/irobot_roomba_630_battery_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/parukagebus.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/59190664751.pdfIn PDF document text
    • https://6f847715-c85a-45d9-ae5c-7c68cc800588.filesusr.com/ugd/6e100b_d29c0780621949eca67a23ea75360b7c.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_62528cb564384ddf91fed00643d3cdc4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/19949364764.pdfIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_ea57b870b7eb461ba9cf5942a0cf50b8.pdf?index=trueIn 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_off00010699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 5352 bytes
SHA-256: d6d888d6d2513ae61a775435d4b4d4512b7a808488b71b4bb44870ab7f1f2e83
font_01_sfnt_off000118cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CD 10376 bytes
SHA-256: f7ebc5b3cdfd99dca1888ca39f1151b31d8bb24033dab5122d7ed902439cd080

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