Malicious PDF — malware analysis report

Static analysis result for SHA-256 d830fd4818f1bd98…

MALICIOUS

PDF

71.1 KB Created: 2021-02-15 11:42:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2294b7309cdf7b61847cc017f628269a SHA-1: 286b569e31817544a457fb1d68c2267c9f38e4f4 SHA-256: d830fd4818f1bd9882db78097ca230aeb28826cdc1c53ece736cde96871b28a2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs points towards an attempt 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://jacksth.ru/strik?utm_term=heat+exchanger+tema+type+beu PDF link annotation
    • https://bituzuvuzi.weebly.com/uploads/1/3/5/3/135389462/garupeluriz_disirefusiv_gevefitu_zuxudu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387218/normal_5ff5f8a6615c3.pdfIn PDF document text
    • https://desebenenoda.weebly.com/uploads/1/3/5/3/135348916/9abac3e8.pdfIn PDF document text
    • http://goodnatural.space/gre_vocabulary_app_free_downloadnyiqp.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/O3RgdA0/apple_watch_infinite_loop_band.pdfIn PDF document text
    • https://mejotozoferu.weebly.com/uploads/1/3/4/8/134866749/5901583.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/cpge7ja/purewabu.pdfIn PDF document text
    • http://adyga.site/ludabejimarafiganifasadezwc1bk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423154/normal_601dba2844a63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454277/normal_5fe1d3cdacfa4.pdfIn PDF document text
    • https://masogivuxun.weebly.com/uploads/1/3/4/8/134887982/2d4c2534.pdfIn PDF document text
    • http://reawont.online/17551044750kzg0.pdfIn PDF document text
    • https://cdn.sqhk.co/xisofofumew/elie4tg/play_bubble_puzzle_97_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuponefi/beforward_toyota_rush_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/joint_affidavit_of_marriage_format.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/80111989445.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_off0000d9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E1 5408 bytes
SHA-256: ccb473e17374dfe5be6a159376111ea632e1a10e0050a2935ce1ca801728d480
font_01_sfnt_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 10456 bytes
SHA-256: 35c483934393e2e8a2632411a54086700ed8b4a150e9ec2486990d171a30f904

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