Malicious PDF — malware analysis report

Static analysis result for SHA-256 2acb421e561345af…

MALICIOUS

PDF

70.6 KB Created: 2021-03-20 03:16:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e10b0019436075fb90ff5e8ba3f106fb SHA-1: 17e7f249fef800758b3c01581784e06984e5a532 SHA-256: 2acb421e561345af9cf3f1a3b746c67f7856074f77c78f912b66e2db9983520b
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URI pointing to 'mezovuduw.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to 'free autocad 2020 tutorial pdf'.

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://mezovuduw.ru/award?keyword=free+autocad+2020+tutorial+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412896/normal_60552e8125cfa.pdfIn PDF document text
    • https://cdn.sqhk.co/wanadujogo/rMjaiij/64266916233.pdfIn PDF document text
    • https://cdn.sqhk.co/lopovekis/EB63Ehd/open_camera_pro_apk_terbaru.pdfIn PDF document text
    • http://torixewiser.medianewsonline.com/3018427533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459025/normal_60368a9b164a6.pdfIn PDF document text
    • http://gatokin.iblogger.org/information_of_abstracted_empiricism.pdfIn PDF document text
    • https://susutabum.weebly.com/uploads/1/3/4/4/134464128/ziwotosigujumiv-musitimedaz-pepunumul.pdfIn PDF document text
    • https://jukovuwivoxufab.weebly.com/uploads/1/3/3/9/133997180/5787000.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/S53p1Ai/7118403972.pdfIn PDF document text
    • https://mazefitarunakur.weebly.com/uploads/1/3/1/4/131453858/d1950.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/antibiotics_choices_for_common_infections_2020.pdfIn PDF document text
    • https://muluxebaxomoj.weebly.com/uploads/1/3/5/4/135401331/jotajijar-zepaxusebagibin-tiniv.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/9661ea53-05c4-4b4e-a6c3-3cc106f9d46a/68442300228.pdfIn PDF document text
    • http://lelisavebak.rf.gd/how_does_fitbit_calculate_calorie_deficit.pdfIn PDF document text
    • http://xigilozixorod.epizy.com/11632698039.pdfIn PDF document text
    • http://molumazorok.rf.gd/e_aadhaar_card_download_password.pdfIn PDF document text
    • http://xoxekojut.onlinewebshop.net/sesevumoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c3f805f-bd5b-4972-aad2-5f741e1bb983/nofipirosasonelasuvi.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_off0000d921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD921 5200 bytes
SHA-256: 0b4306f99fb028bc016cb1cb4925c4c48d368a433e962133a90944fe4ec64cbe
font_01_sfnt_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 10164 bytes
SHA-256: e9ff79dccefba4a17182a2d5c455a16abfc877bf5fe3f96a6e4c894e8db74d76

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