Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dd99090dd4394a6…

MALICIOUS

PDF

77.0 KB Created: 2021-03-05 11:05:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5ccd003bc0151422d2d69f35fb52631f SHA-1: 4c0d3588b2914f6c748214283f7a1adf87b0273f SHA-256: 7dd99090dd4394a62abd0b2f24f75f975a7baf99880a7c44f6a6e81cc0b745be
126 Risk Score

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 numerous embedded URLs, many pointing to disposable domains, and is described as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy to host numerous PDFs on disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/wix?keyword=juegos+de+un+show+mas+cartoon+network PDF link annotation
    • http://panuxidoku.22web.org/78460257848.pdfIn PDF document text
    • https://cdn.sqhk.co/raninogozo/Tvv5uhe/83989887953.pdfIn PDF document text
    • http://remastacer.com/african_american_full_history_moviesydsjs.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/c2HUKuO/background_video_recorder_para_iphone.pdfIn PDF document text
    • http://fishing-rods2.club/guidelines_meaning_in_tagalogikgzj.pdfIn PDF document text
    • https://cdn.sqhk.co/wozovege/fjgjggd/46912958824.pdfIn PDF document text
    • http://kvyovk.xyz/556753344687om0a.pdfIn PDF document text
    • http://dragonflysagewellness.com/714478147296o3he.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzowadijavu/PjdBVoZ/red_spiky_balls_on_leaves.pdfIn PDF document text
    • http://kujuwuwoseg.iblogger.org/reading_comprehension_test_with_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/dudokirabog/hcjbjfN/51154935002.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ripibaveg.rf.gd/windows_server_2012_r2_serial_key_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/formative_assessment_strategies_for_every_classroom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cccfed95-8ceb-4e04-921a-0fc754081922/57119665544.pdfIn PDF document text
    • http://lakuxizutigevo.rf.gd/dental_infection_antibiotics_guidelines.pdfIn PDF document text
    • http://tisizewim.epizy.com/13158828845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/457848a8-da04-4af7-8ee7-fbdd5e9a0418/73888425144.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/69197719158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e7e8613-31ae-4bb3-8430-16778ce32243/apc_by_schneider_electric_back-ups_es_700_manual.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_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 5468 bytes
SHA-256: 04f0c114006d50e1a0897cd93a0b8a1b7de4924b91b969ef72f4b92d517bb484
font_01_sfnt_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 10508 bytes
SHA-256: f8bc8da78c3ccbd2b4b179a03910f00f5cc9d562145d223a8b2655b62306462c

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