Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74503f8884489c8…

MALICIOUS

PDF

69.4 KB Created: 2021-03-02 08:54:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 76052ca0a8f4413eb2fa80cec03d6af3 SHA-1: 89c3760923b6e0db3eb96d0e571fd9d9df6a28ef SHA-256: c74503f8884489c87641eb8434d88f685d8e5cc014f5d9c4d25bec44d6833710
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to disposable hosting and link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://lozipotod.ru/wix?keyword=the+absorption+of+chlorophyll+worksheet+answers PDF link annotation
    • https://vufomugivubi.weebly.com/uploads/1/3/5/3/135350936/3437721.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/eJjhiSK/real_car_racing_game_3d_mod_apk.pdfIn PDF document text
    • http://kozlo.space/7847266293715x4z.pdfIn PDF document text
    • https://cdn.sqhk.co/xelibini/N10Eja9/lucky_block_race_server_name.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423728/normal_5ff7ac07b898d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421038/normal_5fd2883b826c9.pdfIn PDF document text
    • https://cdn.sqhk.co/lusimalifa/Mgh27MM/.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_6010a451701ac.pdfIn PDF document text
    • http://help-copyrighteamservice.com/how_often_to_change_oil_2012_honda_civic7p1n8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486045/normal_600dda08e261b.pdfIn PDF document text
    • http://bilapak.66ghz.com/acf_pro_5._8._1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469135/normal_601bab7aabdbb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bibuligo.epizy.com/24837797592.pdfIn PDF document text
    • http://fuvarob.epizy.com/burnham_boilers_review.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/megogo_android_tv_4pda.pdfIn PDF document text
    • http://rolaxaja.rf.gd/how_to_read_bjt_transistor_datasheet.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_off0000d498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD498 5452 bytes
SHA-256: f9ea004bd0a5cbd03a10f1692f3cb6b9a7f56e955e065e18214f525a4f323a02
font_01_sfnt_off0000e72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72C 9740 bytes
SHA-256: 40f43db382eb004c3011e76cbd1679f676b788463f5374b3f72dbe2136781e12

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