Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63043d24cee9b3e…

MALICIOUS

PDF

72.3 KB Created: 2021-04-01 04:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2518f0586c20e038d58fd27850ece589 SHA-1: 6d05cc2446c22a2ed22e032a7374cf982b9e1595 SHA-256: d63043d24cee9b3e8b88212ad771aa1d494b1f0ac247cffe8b964caf24633602
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary lure appears to be a 'chemical properties worksheet answers' document, which redirects to a URL on 'bologen.ru'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=2.3+chemical+properties+worksheet+answers PDF link annotation
    • https://pufoputinagof.weebly.com/uploads/1/3/4/2/134234879/d63bdf7ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402252/normal_603ad1092f12d.pdfIn PDF document text
    • http://goods-amzon.com/suvawitutotunagununi81e.pdfIn PDF document text
    • https://losanuritajog.weebly.com/uploads/1/3/4/7/134730792/bbc52379.pdfIn PDF document text
    • http://kraftmann.su/telogonixezabzmf9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421330/normal_6009f81b6b776.pdfIn PDF document text
    • https://cdn.sqhk.co/retobumoki/AJjcgdl/philadelphia_flyers_mascot_dancing.pdfIn PDF document text
    • http://brosbass.com/bade_miyan_chote_miyan_remix_song8vigw.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/ieie9gc/total_conquest_hack_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/novigigexuxo/ghjcuji/best_r_b_music_videos_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370985/normal_6019939a985a0.pdfIn PDF document text
    • https://cdn.sqhk.co/nidaruzada/cjdNIyt/love_stars_happy_balls_brain_puzzle_game.pdfIn PDF document text
    • https://cdn.sqhk.co/xuteposidobi/a5pvjgY/27979841518.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409614/normal_6052ca6d54395.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/pafexegud/sample_forensic_audit_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9b59f35-c555-48a7-bf5f-07b1e162f008/wugokosodikonomolep.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/padodadolezepatixed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0368479-6c1a-4e0c-9087-8cc3fbec9075/quiznos_subs_nutrition_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/495a6c89-5645-4501-89ca-f39979385752/gusugoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/whatsapp_for_nokia_lumia_640_xl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/434a2684-0960-4180-b325-e402bf7c1b98/stack_data_structure_in_c_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ab84126-7524-496f-b860-041136b8c899/metro_2034_gameplay.pdfIn PDF document text
    • https://s3.amazonaws.com/wipotegadodorek/what_stores_accept_bass_pro_gift_cards.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_off0000dd0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0A 5564 bytes
SHA-256: ce2e9b2d3fd1ec6b487198c9d13f3399e26faf1495323ba1a296cff1735fae9a
font_01_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 10412 bytes
SHA-256: f24d166b66049d85beb44c274fd57128e5a0864f45c2083dad4a421baea26d4d

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