Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37cba3a4015a43c…

MALICIOUS

PDF

91.8 KB Created: 2021-03-09 01:19:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a1b648a91e0a0ca768e3ad06cc923783 SHA-1: 595f3f3eb260fb4d368935ba3c7ac8852d9c3788 SHA-256: e37cba3a4015a43c0d5d655e5310f21c327d69da23fdeeb7a8e5c1d2152154bd
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, and heuristic analysis indicates it functions as a link farm on disposable hosting. ClamAV detection as 'Pdf.Phishing.Trojan' further supports malicious intent. Although no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics suggest the document is designed to redirect users to malicious content, likely for phishing or malware 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://golowaki.ru/award?keyword=human+fetal+development+pdf PDF link annotation
    • http://raguvigawak.mypressonline.com/zikevisarubavibusawabu.pdfIn PDF document text
    • http://ruguwafe.scienceontheweb.net/2_phase_method.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/jgcgcNJ/jagonokakobukezirelaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371025/normal_60288f443e77a.pdfIn PDF document text
    • https://cdn.sqhk.co/miseseren/hjpghan/gaming_zone_apk_linkshrink.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428039/normal_600fbb8d6e2db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450630/normal_5fd61d5a1c7fe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7627fc-4a71-4ae3-90f6-d680ea4bc0d8/53527940999.pdfIn PDF document text
    • http://bagozorox.rf.gd/48136533793.pdfIn PDF document text
    • http://bumojomoso.rf.gd/kiwonepokawijekivetos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dea90ee9-d632-45e1-a9a2-e6dba3ed4da0/18791824426.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/gapifapibe.pdfIn PDF document text
    • http://domuromu.atwebpages.com/how_much_does_a_round_bale_of_hay_weigh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aee7b9f-8f1d-4023-8acb-851c262f8912/45922323928.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_off00012a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3C 4932 bytes
SHA-256: 1a0cdd53ba212735a56a35855261822103b0ecb05d8fe5cbe91493cb077be7b7
font_01_sfnt_off00013afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFB 12128 bytes
SHA-256: ea70a1036c00483ee990c77d9af5343a7a613fbe64319530d74c093bc8e91a18

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