Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bfc631e0413d47…

MALICIOUS

PDF

93.0 KB Created: 2021-04-28 22:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 57c7ca87ed83b9320f68ec7d1d4c2126 SHA-1: 8bd9f4bdcfa3524fb6e23cc18adbf11cea00f536 SHA-256: 88bfc631e0413d4705eedb696efc24643c2aff95204daadb9a6109c3ebe73c6b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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/strik?utm_term=neon+genesis+evangelion+the+end+of+evangelion+soundtrack PDF link annotation
    • https://cdn.sqhk.co/jumibizede/jjicZ0H/bloodsport_20-_inch_crossbow_bolts.pdfIn PDF document text
    • https://cdn.sqhk.co/nowegizin/cvjdcgf/pacsun_cyber_monday_coupon_code.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420747/normal_604d315c6f4a4.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn.sqhk.co/nunemiziku/gjEUrjc/73582854771.pdfIn PDF document text
    • http://b4shop.icu/bestway_pool_pump_owners_manualvjyp1.pdfIn PDF document text
    • https://cdn.sqhk.co/govuzupikiwe/Xgjnhjq/14833512105.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389370/normal_60005f6391288.pdfIn PDF document text
    • https://cdn.sqhk.co/zakikola/Gifjcjg/81795713408.pdfIn PDF document text
    • https://cdn.sqhk.co/zopizote/ihhgjih/infinity_stones_marvel_movies.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481275/normal_5fdfb144b7cae.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/gcBrlLL/truck_hero_3d_mod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4eb1cc6-5813-476a-942b-022a53c5ebae/dufifiseva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f561ddf-02d1-4d9c-85ab-b3edd3fee382/how_to_reset_honeywell_thermostat_after_power_outage.pdfIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_1d317a45c8cc4cf3b6fbf08880264e45.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f32d45a-01b4-4985-aa57-f67a19eab7ef/bissell_pet_pro_plus.pdfIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_8afdee97442b49609b1fcc30e33173ad.pdf?index=trueIn PDF document text
    • https://1a899ca6-11bf-4464-971e-4bf0b885e765.filesusr.com/ugd/4ac3ff_ca125e951f034555baa9a501631989b6.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 20536 bytes
SHA-256: 34505f977d54b445cfe0619037571abdee317b45cde28303d9891a2485b93cec
font_01_sfnt_off00012c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C27 5376 bytes
SHA-256: a8d3d1a4b084f907da37975c17bf32c8fe7fb420a6b6a94fc8610764e10d2e74
font_02_sfnt_off00013e78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E78 11184 bytes
SHA-256: 9f93b02dbe8e96b4d2690c95391f27f262806d9245c08332761fca5ea2666302

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