Malicious PDF — malware analysis report

Static analysis result for SHA-256 643f121355844761…

MALICIOUS

PDF

80.3 KB Created: 2021-03-01 04:03:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2c0f51df80bcb8e92c5f2549ff5657c1 SHA-1: 247e034689b9d052e27f50de41531c45b85c3776 SHA-256: 643f121355844761d44cc3fc910bfe6a8cdf9214312f940aa807b719471766b4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of many external links points towards the document's primary function being to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=how+to+draw+realistic+face+procreate PDF link annotation
    • https://cdn.sqhk.co/bomoxale/WE23Vje/real_gangster_crime_mod_apk_download_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/jefigujaxev/hzghche/44922773734.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/eaighcM/61594700009.pdfIn PDF document text
    • http://vorusobowa.66ghz.com/ciencia_y_tecnologia_en_mexico.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420432/normal_60083686e5d53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419623/normal_6013c41bae52e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419654/normal_60001e1bef662.pdfIn PDF document text
    • http://novedexezenel.66ghz.com/how_many_carbs_does_dunkin_donuts_iced_coffee_have.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426682/normal_60308aa539866.pdfIn PDF document text
    • https://darefosal.weebly.com/uploads/1/3/4/6/134601331/zovapawupolemu.pdfIn PDF document text
    • http://xviiivbgz.com/2015_toyota_highlander_repair_manualqw99v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380863/normal_5fd6a9ec3efff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nusilelopalal.epizy.com/airlift_3p_manual_mode.pdfIn PDF document text
    • http://jisijuvod.myartsonline.com/son_of_dathomir_comic_book.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_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 5436 bytes
SHA-256: e7276e182acfc7d2d9e011f48200adc084c4f0e31f81e294e1d02431a53f0675
font_01_sfnt_off0000fe91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE91 5200 bytes
SHA-256: 5154dda4bd051ddb4e82060410ea8607a18bfafff4111449c1a951d94620c83a
font_02_sfnt_off00011065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11065 10268 bytes
SHA-256: b9816aa9256e076d03a746e9f7f5318ad70597c9fbd19875e3459ce20655f34f

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