Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a27866465fb0914…

MALICIOUS

PDF

88.0 KB Created: 2021-03-14 13:30:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a9808f0adb6f66bee6a98e95e8098fc5 SHA-1: fc67622a77b3cb385d4d8b49dc53880dcdc633da SHA-256: 5a27866465fb0914b153515614cd125a6375cad0679fe6e9a976fa25a5180492
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains and are likely part of an SEO link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically related to phishing. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/123?utm_term=notes+1.+2+segment+addition+postulate+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411480/normal_600a0bd95af31.pdfIn PDF document text
    • http://insurancesouk.com/tork_1103_timer_wiring_diagramx0dya.pdfIn PDF document text
    • https://famemizi.weebly.com/uploads/1/3/6/0/136006686/5707528.pdfIn PDF document text
    • http://centerbluebadge.com/975494387445sxao.pdfIn PDF document text
    • https://xaredoluvowa.weebly.com/uploads/1/3/1/8/131871785/lasiwetiwam-kemubiverixeva-sewewokogafu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383322/normal_5ff69f131563d.pdfIn PDF document text
    • http://unlockdeals.shop/craftsman_208cc_snowblower_startikp9o.pdfIn PDF document text
    • https://powilumoratome.weebly.com/uploads/1/3/4/3/134368047/1265025.pdfIn PDF document text
    • https://rotutokobuzafoj.weebly.com/uploads/1/3/4/4/134455929/06a155cf3fe51.pdfIn PDF document text
    • http://trokot-shopnew.online/befirezijajunixiragupejum4vmzp.pdfIn PDF document text
    • http://runolive.com/40424389721g4yki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385887/normal_60263c3d799e9.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://be5a03d2-cb36-429a-bb4d-4773f067dd3b.filesusr.com/ugd/b46ca8_adc06ccff721465c872172301bc249cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9b46e65-73fe-4f44-b4cd-85154b2a7806/what_to_do_if_logitech_keyboard_stops_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0716aaa2-3af1-4957-bf40-fba273119916/72672026812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5cc7cee-e2f7-49b5-9d94-b25c13bd8cfd/70360680894.pdfIn PDF document text
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_9d2919fb41f64cf78a2ea33acf25c468.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c8715af-be1d-410d-9938-00ada0e16735/what_is_a_purple_cow_at_shake_shack.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_off00010c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C88 5436 bytes
SHA-256: d1690018a90152358ea1f30dbe872513f5324d1a52386d497cbd29afe8d98ca6
font_01_sfnt_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 11008 bytes
SHA-256: fe0ef916e1714995d3c13829082e8c707622815b5b0c3118a315e760e00ac549
font_02_sfnt_off000144ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AC 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3