Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f3de6a157f41e0…

MALICIOUS

PDF

98.1 KB Created: 2021-03-05 10:24:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 2f54c38fc5dd9f28f99c63561531e45c SHA-1: ac782a327a1b5f516fd7e9177c47d15c24e40341 SHA-256: 42f3de6a157f41e0bd4a658abb3d0ead758307ee1e43f73d577cc03be474c449
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://crophysi.ru/strik?utm_term=a+single+shard+chapter+2+summary PDF link annotation
    • http://baderakavakuf.22web.org/dawobaje.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/iXUtjjN/fudekapikezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453560/normal_601233266d052.pdfIn PDF document text
    • http://doworevo.22web.org/xinekupozep.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/ab7hhMJ/pitbull_dog_for_sale_in_california.pdfIn PDF document text
    • https://cdn.sqhk.co/xorazasuno/jcBjfam/damopa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410694/normal_5fecafe5d0c72.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/jh8IgfV/spin_tops_hack_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gotuxixovumu/x9jj6mT/69613207892.pdfIn PDF document text
    • https://cdn.sqhk.co/kikepedu/s1jegfa/9650796978.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/bVBBicu/business_plans_for_clothing_lines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417318/normal_602d02783c98a.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/Lifffuy/1874597655.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405642/normal_5ff65691c2d2f.pdfIn PDF document text
    • https://cdn.sqhk.co/lajoroteb/jd9vZjj/thakur_prasad_calendar_august_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vibosaxijus.rf.gd/bike_stunt_images_free.pdfIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_af80c52cf8fc482fbf14ff7bd07c27a0.pdf?index=trueIn PDF document text
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_3215d1af2e23467681052ba72fa93bcb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a33c37a-271e-43f0-9ca4-69201448d56f/10800963459.pdfIn PDF document text
    • http://kilirafesiva.epizy.com/12560180234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82074cac-a532-4b44-9866-8b0f1e105a6b/the_soul_of_money_barnes_and_noble.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7b0fa64-20b9-4e5c-8d4f-5bcfd00487bc/guxebazos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9719b99-ff30-4f23-b90d-29b19b8bca2b/medovosopad.pdfIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_50425975a3cb45d48a25505019813cc3.pdf?index=trueIn PDF document text
    • https://5a8aee2d-3d68-4c09-98ed-743c9c56d6fd.filesusr.com/ugd/460efe_252c6720169e448c9993e9da1d1c3914.pdf?index=trueIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_a317e60a64fb41a5a50211e65f34a1c4.pdf?index=trueIn 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_off000144ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FF 5712 bytes
SHA-256: ed8e4ca2018c45b4c31b7d72775aee63060a169846d7e0cfb60f39b368572b69
font_01_sfnt_off0001584e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1584E 10148 bytes
SHA-256: bbb63cda9e3d500d8dfb51dc94c344150f535e6352813d35247334a3c42cc716