Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d170bc4d36f3088…

MALICIOUS

PDF

73.7 KB Created: 2021-03-10 02:51:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 08b61c7f5227e6b2845b3f780c07e343 SHA-1: 21622799adb34a62a0797bf47435f0017cb93d10 SHA-256: 8d170bc4d36f30886a28e6ff9dab742e981bfa0a6d8e6036ca1d632834dd96a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, contains text related to an exam, likely a lure. Numerous embedded URLs point to disposable domains, suggesting a link farm designed to redirect users to malicious content or download further payloads. The presence of external URIs and link farm heuristics strongly suggests an attempt to trick users into visiting compromised or malicious websites.

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://midufefew.ru/award?keyword=cambridge+pet+for+schools+exam+pdf PDF link annotation
    • http://siloxolilalapas.22web.org/vimimesigofofilugebugu.pdfIn PDF document text
    • http://ruwegekugite.22web.org/79487125582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369926/normal_60222bd4c1b4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384655/normal_601bb9b8a559f.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/fb46c7eb-20ff-431d-ba8c-8f7aec000300/5155156344.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/ghost_shooter_movie_free.pdfIn PDF document text
    • http://kejufunekopal.epizy.com/dulapuwewemewalaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/just_2_words_puzzle_541.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd1b514b-c005-41fa-a548-8a426ffc1c69/better_than_ever_synonym.pdfIn PDF document text
    • http://nulesuli.epizy.com/63976197978.pdfIn PDF document text
    • http://lofowopajuror.rf.gd/domanativulakigofibekixa.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/moxemumevatazezeguvol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b5a5bea-77e4-4f27-87a9-384bffaf60e2/bloons_td_5_hacked_unblocked_games_66.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6bddfb2-6dd1-4df3-b3e3-cb8427a2e5f0/78964105965.pdfIn PDF document text
    • http://tosogaxaf.rf.gd/30972136813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00832b0c-339f-4027-b4cc-9d2d0648ddaf/living_sober_book_audio_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/403b9b3c-89cb-4d23-b360-2bc39435a011/vijitu.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_off0000e28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28A 5684 bytes
SHA-256: d6090ad2e4b07fb03e20638a5a74829cbd57e927e9918002e7d60c9e90b84b08
font_01_sfnt_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 10604 bytes
SHA-256: 39dbc2871658fc1f07bb14b0d55dd243b2b6e3d0a0742bc7a142cf40e6b47c51

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