Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcdd08e5222a5289…

MALICIOUS

PDF

69.0 KB Created: 2021-02-11 21:51:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6da0bfdb7c7b7ba00a8ac72ba3c2df7f SHA-1: 5c123d7667c1a72be39408e85230fa57148bc735 SHA-256: fcdd08e5222a5289d47743126ab34c6a4e4196b53836717c367642d217e33bf8
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, many of which point to disposable hosting services and are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a tactic to obscure malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The presence of embedded URLs and the link farm structure strongly suggest this document is part of a phishing or malware distribution campaign.

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://crophysi.ru/123?utm_term=psychology+2nd+edition+schacter+pdf PDF link annotation
    • https://zavegaligap.weebly.com/uploads/1/3/4/4/134499553/pajujikel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371269/normal_6005978f4785a.pdfIn PDF document text
    • https://cdn.sqhk.co/loboremetoxe/hfMjjvQ/mr_frosty_ice_cream_maker_ingredients.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418370/normal_6013c16c34cbd.pdfIn PDF document text
    • https://cdn.sqhk.co/bijowiroma/dtPdjeQ/buttons_the_movie_tim_janis.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvinudubuno/jnIYpak/amazing_powerhero_new_york_gangster_hack.pdfIn PDF document text
    • https://wexasubofuxumeb.weebly.com/uploads/1/3/2/7/132740188/sabexutigafo_gezalokituti_xitinarobopa.pdfIn PDF document text
    • http://discovljzg.fun/british_council_phonemic_chartw8tm1.pdfIn PDF document text
    • https://serewutedirafam.weebly.com/uploads/1/3/5/3/135339767/8714119.pdfIn PDF document text
    • http://feedbacrnz.space/jazexezemevisowinakf3sh5.pdfIn PDF document text
    • https://rofujerejikuf.weebly.com/uploads/1/3/5/3/135388349/29fa556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445881/normal_5fda872bbbb4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446496/normal_60031f321c2a5.pdfIn PDF document text
    • https://fofirajajamide.weebly.com/uploads/1/3/4/6/134643930/6088308.pdfIn PDF document text
    • https://xigarivopupu.weebly.com/uploads/1/3/5/3/135300822/jotupefasi.pdfIn PDF document text
    • https://jasedulenenude.weebly.com/uploads/1/3/5/3/135328633/gawifotuwerek-pudebabobiwawal-wujera-nutapuxiti.pdfIn PDF document text
    • http://lisolu.org/586353999277af6k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11D 5652 bytes
SHA-256: b922d5b58e6dd05a7929c05acc37a5a8406ce42989586e9d0a44dc5c7c3f3d20
font_01_sfnt_off0000e45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 10204 bytes
SHA-256: 95294d61f668bdf0d20ef185f99b9203cb74cbdccd9cc2883ac5fe35af3d5155

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