Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4ffc78b4a1a2a3…

MALICIOUS

PDF

76.0 KB Created: 2021-02-22 22:41:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: dbaea8ef1f0fbf31f5724c31e48da6f2 SHA-1: 7d78b575896614136171d534a64b7befd76131ad SHA-256: ca4ffc78b4a1a2a33359bcdc4d63cad6a1829963afcf05e7429f83ec6ef9eebb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or distribution point for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

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://bologen.ru/wb?keyword=inheritance%20cycle%20book%204%20read%20online%20free PDF link annotation
    • http://good-production18.site/emulsions_foams_and_suspensions6xhog.pdfIn PDF document text
    • http://consequences.space/xafasuwijubovifempoo.pdfIn PDF document text
    • http://panuxidoku.22web.org/19415285750.pdfIn PDF document text
    • http://cardio-natural.info/75305765906b38x7.pdfIn PDF document text
    • https://talovilivakalod.weebly.com/uploads/1/3/5/3/135326419/lewepatefiwegeduri.pdfIn PDF document text
    • http://tuworiki.22web.org/family_travel_itinerary_template_word.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391620/normal_5fdc46aee9925.pdfIn PDF document text
    • http://subagibetuvipi.iblogger.org/taurus_pt_22_trigger_problems.pdfIn PDF document text
    • http://all-gopro.com/2441227731948fp7.pdfIn PDF document text
    • https://sarefipa.weebly.com/uploads/1/3/1/3/131398419/601986be1.pdfIn PDF document text
    • http://wotevolodux.iblogger.org/ge_4-device_universal_remote_control_manual.pdfIn PDF document text
    • https://jajibesuwazigix.weebly.com/uploads/1/3/1/3/131383486/kobogegalekuzujejiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kowekunebu.rf.gd/mojonuvujuga.pdfIn PDF document text
    • http://lonuzokubezuva.epizy.com/id_card_photoshop_template.pdfIn PDF document text
    • http://pibimosozo.rf.gd/tactic_for_listening_basic.pdfIn PDF document text
    • http://varowok.epizy.com/howard_miller_grandfather_clocks_repair.pdfIn PDF document text
    • http://fofebur.rf.gd/100_dollar_startup_business_ideas.pdfIn PDF document text
    • http://demoxivefuwuvi.rf.gd/laganufal.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_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 5260 bytes
SHA-256: efa78c61b0a2c6ae0879427c9a83188a6fa33a24dc53f8adaa45088ae80a41cf
font_01_sfnt_off0000ff9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9F 10252 bytes
SHA-256: 0374b40e9cc5b1653fdfa59f2473f7ba949bbb16fb81db2d5ec45d7bef89a680

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