Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6ca22ca3439b66…

MALICIOUS

PDF

74.6 KB Created: 2021-02-27 03:29:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 7b2c4d29dc3c9a57264eaf0545701c9b SHA-1: bf712eab2203df11c4d0129bb91bc73780505935 SHA-256: 1c6ca22ca3439b66fc18cf9be33c55979be8c69300853c6ae830d2ea0676b2b7
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to disposable domains, a common tactic for SEO manipulation or distributing malicious content. Heuristics indicate a link farm designed to redirect users to potentially harmful PDF files. While no scripts were directly extracted, the nature of the links suggests a potential for further exploitation or phishing attempts.

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://bologen.ru/strik?utm_term=boy+scout+merit+badges+online PDF link annotation
    • http://money-team.site/jinigaruwonato1j8bf.pdfIn PDF document text
    • http://nubolutlion.xyz/nonfiction_reading_comprehension_worksheets_3rd_gradeilreb.pdfIn PDF document text
    • http://gilumesu.mypressonline.com/vox_ac15hw1x_footswitch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453908/normal_5fd965b63c1c4.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/83777044444.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/lemapobenuteposaniri.pdfIn PDF document text
    • https://rilavowa.weebly.com/uploads/1/3/2/7/132740415/wedim.pdfIn PDF document text
    • https://savakofanedekin.weebly.com/uploads/1/3/4/8/134872369/6724877.pdfIn PDF document text
    • https://nikudedixipapun.weebly.com/uploads/1/3/4/6/134692686/gonomajigedi.pdfIn PDF document text
    • http://instapodarok.site/facebook_marketplace_local_pickup_only6ry9f.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/hwibiif/fipewo.pdfIn PDF document text
    • https://siwevamad.weebly.com/uploads/1/3/1/8/131871433/wunabafopenosi-sunofin-bawiwabepako-xoxajefatesavaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457330/normal_5fda038c2511e.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/jiRv5hg/90000114069.pdfIn PDF document text
    • https://sosakenokez.weebly.com/uploads/1/3/4/4/134445245/0f39aa3.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_off0000e4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 5552 bytes
SHA-256: b346b38be688d19820e96b4a996c43d043d1cf546c7b08103639c10bf1028cc9
font_01_sfnt_off0000f796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF796 11404 bytes
SHA-256: 6b08c0fe73074c1f3c45258fccc9551e4f62128c6d42f38ce065d5eaa979c8ab

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