Malicious PDF — malware analysis report

Static analysis result for SHA-256 6248fdef7d18e394…

MALICIOUS

PDF

75.8 KB Created: 2021-02-11 19:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5ebb7bcdd39a5eb97c02d598488d8590 SHA-1: 6bff8b705862ff291426eb77cc1eab48c2a3bbd1 SHA-256: 6248fdef7d18e394f541cbd966416ddd727fa82edc54b9d7c7fb40e01ac711c9
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 hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, suggesting the primary goal is to redirect users to external sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML detection strongly suggest a phishing or malware distribution attempt.

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://jacksth.ru/123?utm_term=scott+paschal+tennis PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451023/normal_60161e18ab8eb.pdfIn PDF document text
    • https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/cb704.pdfIn PDF document text
    • https://cdn.sqhk.co/wavagowew/jbgjicU/94250302646.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/fwb3V2H/wakikusarezon.pdfIn PDF document text
    • https://rafunipigadim.weebly.com/uploads/1/3/1/3/131380466/643accb10bfe0.pdfIn PDF document text
    • http://uaportal.site/aflatoxin_m1_in_milkatpzd.pdfIn PDF document text
    • http://forexgeeks.net/jonisepupigirnu3ux.pdfIn PDF document text
    • https://dutizadip.weebly.com/uploads/1/3/4/8/134889078/fevup-tikuseto.pdfIn PDF document text
    • https://vuxomikegivu.weebly.com/uploads/1/3/1/4/131453843/zosififorijada.pdfIn PDF document text
    • http://ragaliteres.iblogger.org/bbc_entertainment_tv_guide_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/woxiwovar/a2SuUCz/doctors_care_columbia_sc_two_notch_road.pdfIn PDF document text
    • http://streichpack.online/2758940593w131w.pdfIn PDF document text
    • http://linorusani.iblogger.org/38993711549.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
    • http://dokelegusipodi.epizy.com/accident_report_case_number_lookup.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/circuit_simulator_apk.pdfIn PDF document text
    • http://kozirexufogepi.epizy.com/mandibular_distraction_osteogenesis_case_report.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/oxford_basic_english_translation_book.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/88897664819.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_off0000dd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9E 4816 bytes
SHA-256: ed7f34edde7883f9f58c39055f690cba46e8d328027171d04383e359948a9419
font_01_sfnt_off0000ede0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE0 11256 bytes
SHA-256: 2d8425c5a4b44b1ee35c88aef3bbf2ff2eae5dcae9254618dd3b4b515bce9320
font_02_sfnt_off00011434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11434 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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