Malicious PDF — malware analysis report

Static analysis result for SHA-256 873450d6a0d173b4…

MALICIOUS

PDF

75.6 KB Created: 2021-03-14 14:32:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 47c33385f3bcac21b489cf17efbe1593 SHA-1: 2f4453f93ddbc32fca02f74ce02758705233e15f SHA-256: 873450d6a0d173b448ce11fd764e643f3b02a9ef5e413e12dd5bc10996ea418a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'bologen.ru', which is likely part of a phishing campaign. The PDF's structure suggests it's a link farm designed to redirect users to potentially malicious content, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic.

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://bologen.ru/wix?keyword=duke+econ+101 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387430/normal_6025b2610bf54.pdfIn PDF document text
    • http://kuliwajijet.22web.org/8478560791.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopivosoba/cjjhejf/spades_rules_renege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464850/normal_603e9d2db6b62.pdfIn PDF document text
    • https://cdn.sqhk.co/fagaluwozez/digDjce/wukotokefavujepitizidalu.pdfIn PDF document text
    • https://cdn.sqhk.co/duditizonut/hbegfgi/game_dev_story_2_pc_english.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://uploads.strikinglycdn.com/files/80ec0ee8-39e1-475a-b976-b2afd352251f/rakubatirir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b86b97ef-6c14-48a0-85b8-b21d0382d308/dd_warforged_colossus.pdfIn PDF document text
    • http://wupotolirenenar.epizy.com/4902931246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7881c81-e07a-4add-9ca8-573707b71208/how_were_the_colonies_governed_before_1760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a96f7bed-758f-4024-948e-5608d41104c1/dyson_dc39_animal_canister_vacuum.pdfIn PDF document text
    • http://bawepefafaz.rf.gd/32945262373.pdfIn PDF document text
    • http://xivutunitilema.epizy.com/jojugifibidokowifanifugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de28cf39-6f28-44c3-8901-688094715db8/45077710801.pdfIn PDF document text
    • http://befokube.rf.gd/21112736439.pdfIn PDF document text
    • http://faguvepeme.rf.gd/django_template_variable_alias.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6cc028d-ec97-4982-bfe6-2223c5fbb35b/15609082783.pdfIn PDF document text
    • http://goterarok.rf.gd/formazione_sale_di_ammonio_quaternario.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_off0000dff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF3 4288 bytes
SHA-256: a4953e2c26a5e0389a8e9d94fbca48574a48f8944fe42f3a9b0a01bf6ab6d4e1
font_01_sfnt_off0000ee90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE90 10856 bytes
SHA-256: 6b967587caefe207b336949bd6399ba874f425adb5b9afe74bd97ebd632754e1
font_02_sfnt_off00011390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11390 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

Open this report in the interactive analyzer, or submit your own file for analysis.