Malicious PDF — malware analysis report

Static analysis result for SHA-256 53029ab7c6b7966c…

MALICIOUS

PDF

69.2 KB Created: 2021-03-15 21:53:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bebe88dc98721d27d25ba1058534b279 SHA-1: b38c2a4e68be4d066600507b60fc3d34a7ae081c SHA-256: 53029ab7c6b7966cf4e819d7db4b38466d59a2412869997cc2b96c5bdc1e45c4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a specific heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=asco+numatics+catalog+pdf PDF link annotation
    • https://poxuxeket.weebly.com/uploads/1/3/3/9/133997588/8d0a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_601e93a66c31b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426263/normal_6041caad5adab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417214/normal_5ff220282860c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501770/normal_5fd22edd79ca3.pdfIn PDF document text
    • http://women-ita.space/koxiruwafozisiytr7.pdfIn PDF document text
    • http://gtomishebs.xyz/la_metamorfosis_personajes_y_sus_caracteristicasqdusx.pdfIn PDF document text
    • http://rcasino.info/lockpickinglawyer_best_gun_lockxr5si.pdfIn PDF document text
    • https://venubitolaxi.weebly.com/uploads/1/3/4/3/134372432/vevufapeni.pdfIn PDF document text
    • http://item-get.top/afterglow_headset_ps4_usb_transmitter_replacementmu7sr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xubedoper.epizy.com/rastafarian_food.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/63560849362.pdfIn PDF document text
    • http://duvugagaxanawag.rf.gd/44201942476.pdfIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_c93add23d4384ada843ebf869a3f40e3.pdf?index=trueIn PDF document text
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_41cfa5179be244d49667e5c5f5366225.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dusined/jogemotakojadomivolab.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/dajuzapatixelad.pdfIn PDF document text
    • http://lojosikol.epizy.com/wimemujulab.pdfIn PDF document text
    • http://zusamab.epizy.com/behringer_xenyx_x1204usb_driver_windows_10.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_off0000ce9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9B 5368 bytes
SHA-256: 6bee4a9dab0800044c0e364b11565ae627c6ca308fe7b7ffdabde248e521de8d
font_01_sfnt_off0000e0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 11224 bytes
SHA-256: 4e7f305461cb9edc68bc1abbf63ba2005fb3aa361029e4ce93a9423932f2efe9

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