Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ccf2c2e87ef11e2…

MALICIOUS

PDF

77.7 KB Created: 2021-03-29 14:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0227a51786e371902b9a32b434895123 SHA-1: c61b7295c4733acaa26d46c7e835df640615be9c SHA-256: 6ccf2c2e87ef11e2af84e850862baa1f2eb140b26da579c3301f551b4e209059
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely lead to malicious content or phishing pages, and the document's structure indicates it's designed to redirect users to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://baarspo.ru/award?keyword=node.+js+express+book+pdf PDF link annotation
    • https://xomadugazulu.weebly.com/uploads/1/3/4/5/134597447/kavosogol-guzozezuponu-xefaguto.pdfIn PDF document text
    • https://fikijumosoliz.weebly.com/uploads/1/3/5/4/135400707/baf9674b4.pdfIn PDF document text
    • https://nerapusu.weebly.com/uploads/1/3/1/4/131438180/f514fedb87f13.pdfIn PDF document text
    • http://tulutita.sportsontheweb.net/96517024392.pdfIn PDF document text
    • https://wajefoxefibivi.weebly.com/uploads/1/3/2/8/132814680/gukizizobov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451033/normal_5fe18ed5d6b1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415065/normal_5fddb8a3df382.pdfIn PDF document text
    • http://sis-paypal.com/common_core_math_standards_grade_2zmiip.pdfIn PDF document text
    • http://help-copyrightservice.xyz/embryology_ppt_templatea4kkf.pdfIn PDF document text
    • http://mezogevap.mypressonline.com/18467046037.pdfIn PDF document text
    • http://foodguideblog.com/dexeke9wrv4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367947/normal_5fdef1dc15b68.pdfIn PDF document text
    • http://vogolimipogusoz.mypressonline.com/bharti_axa_bike_insurance_policy_download.pdfIn PDF document text
    • http://899themes-demo.ru/best_books_to_learn_how_to_tattooidt1n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sakogabutal.onlinewebshop.net/xagatapanozumimijebijiz.pdfIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_ea663e98922447a8899afb383b6c1611.pdf?index=trueIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_c28da943c0d04df8a98923f571085d1b.pdf?index=trueIn PDF document text
    • http://fotizojorirepel.onlinewebshop.net/everybody_wants_to_be_a_cat_clarinet_sheet_music.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_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 5144 bytes
SHA-256: d5477e93a28744b8910220e6ca331868cd1f8e9eb22a235d44b34138f2bad55a
font_01_sfnt_off00010223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 11552 bytes
SHA-256: 346781433375eee069ee98460bf3f2a44ec2b21abb3f42903f1bf56267f308ba

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