Malicious PDF — malware analysis report

Static analysis result for SHA-256 41cc4acf18490a6a…

MALICIOUS

PDF

75.8 KB Created: 2021-03-16 10:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 260e972d6854be5bc0b11b05f9cca8e8 SHA-1: f1eb0dbedd5cf26dfa15a3b4f06691a93526e2c9 SHA-256: 41cc4acf18490a6a236d56aec424b95bbe62ed0551a421e52155be77ff73a260
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to disposable domains, and the document body text is obfuscated and likely a lure. The presence of external URIs and the link farm heuristic suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://pelibifir.ru/123?utm_term=holistic+marketing+approach+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489587/normal_600e0b932fae9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_604383b83cb05.pdfIn PDF document text
    • http://wow50.pro/data_mining_techniques_and_applications_an_introduction_hongbo_du_cengage_learning8ugow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479718/normal_5fdfd19f79872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377931/normal_6028b79400524.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/LDzqgiS/shark_world_hack_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wobimore/ajanjel/polar_roller_coaster_winter.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/fhf9vzM/hitch_mount_snow_blade.pdfIn PDF document text
    • https://telixezudaridif.weebly.com/uploads/1/3/0/7/130775339/tuboger_nipofij.pdfIn PDF document text
    • http://harmony-market.ru/57037774984cmp9u.pdfIn PDF document text
    • https://fagutefoxod.weebly.com/uploads/1/3/4/2/134235025/buvilasabefarixupu.pdfIn PDF document text
    • https://mosivupidener.weebly.com/uploads/1/3/1/6/131637589/8235ff.pdfIn PDF document text
    • http://misstourist.info/coreldraw_for_macbook_pro_freeusigf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://runezejukasik.epizy.com/donasitujonijufagige.pdfIn PDF document text
    • http://muvuxuduxe.epizy.com/13725063016.pdfIn PDF document text
    • http://bikaduwixunu.epizy.com/what_are_positive_behavioral_interventions_and_supports.pdfIn PDF document text
    • http://pewavifasovifuz.epizy.com/wolf_of_wall_street_netflix_malaysia.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_off0000e976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE976 5596 bytes
SHA-256: be81a003c581c5ad97876aa8dee9c5b226b4a48f035a0e3a00da3b4f5e6885fe
font_01_sfnt_off0000fc4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC4B 10580 bytes
SHA-256: e421f9fdbbb5ddb2ed8664c42ede091b4fdf34e948d814e9710d05d2eee7f559

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