Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24d14a8c1962dca…

MALICIOUS

PDF

71.1 KB Created: 2021-02-27 16:16:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: afec59c5c8812e67959ed111ab4a6949 SHA-1: 77f1bec5e521085e6fdf23a8bffb5725f13e65e5 SHA-256: b24d14a8c1962dca9d9d7a025720c65e0ba343f80c5a5dd0ee1a3c7f9ccf448e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent example being https://crophysi.ru/123?utm_term=where+can+i+get+jumper+cables+near+me, suggesting a phishing lure. The presence of external URIs and the link farm heuristic indicate an attempt to redirect users to potentially harmful sites, aligning with spearphishing tactics.

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://crophysi.ru/123?utm_term=where+can+i+get+jumper+cables+near+me PDF link annotation
    • http://help-feedback-amzn3.xyz/z_stick_battle_of_dragon_mod_apko5nb9.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/lijid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421350/normal_601a644721e37.pdfIn PDF document text
    • http://mojenisijita.mywebcommunity.org/john_bunyan_pilgrims_progress_quotes.pdfIn PDF document text
    • http://www-sfr-fr-monespace.com/xosupipinxp7r.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/9423607285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446507/normal_600ad6799828a.pdfIn PDF document text
    • http://simopuvoramawu.mywebcommunity.org/32129611664.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393515/normal_602b83c78bf09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425910/normal_5fd22a16cda28.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/jevelel/guwefazibivajotulepa.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/bidakur.pdfIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/pizisupafonakegoxid.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/what_is_compacting.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/butamizisixalepudol.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_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 5576 bytes
SHA-256: e91199ce62987eec9e3b4e0ad22708ff03355505fe05622bb720f995a5f67137
font_01_sfnt_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 10512 bytes
SHA-256: 22fa6d8c5f82f87fecdc1b1ec5eef7ea12998d953816f1c83cb965da105dbc3a

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