Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f724ea95b88183…

MALICIOUS

PDF

82.7 KB Created: 2021-04-11 02:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 80e95795b5b9a0d0ecac7bae2e98a496 SHA-1: b2b93054ee5cfa4ec23724be089a418421e3da1d SHA-256: 49f724ea95b881831792dbac18831d0610009b89b93d3c45920734f2c2ebd711
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs. One prominent URL, 'https://pelibifir.ru/strik?utm_term=whitfield+pellet+stove+owner%2527s+manual', suggests a lure related to pellet stove manuals, likely to trick users into visiting a malicious site. The document body, though heavily obfuscated, appears to contain metadata related to its creation, further indicating it's a crafted lure rather than legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/strik?utm_term=whitfield+pellet+stove+owner%2527s+manual PDF link annotation
    • https://cdn.sqhk.co/tavikagisato/cieKZJO/blocky_city_ultimate_police_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/setinapas/enfshaz/used_armored_military_vehicles_for_sale_usa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_605257e7545a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392453/normal_5ff49c2f876f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387808/normal_603b24074c260.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/cards_against_humanity_cards.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463263/normal_602fc5086d3de.pdfIn PDF document text
    • http://mopexaxurip.getenjoyment.net/89643286266.pdfIn PDF document text
    • https://cdn.sqhk.co/tedalome/cHyBiek/planet_earth_narrator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461485/normal_60126ac164aec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463560/normal_5fc8104f8e5a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475391/normal_603ebf349b2ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459164/normal_5fe58c3620929.pdfIn PDF document text
    • http://fezatubiwe.getenjoyment.net/94372924743.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/83bca269-8b5b-4cac-8bc2-ba4a1f4a4574/why_is_there_no_power_to_my_lg_washing_machine.pdfIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_88a83348036a4de39f546eef0cbe94cc.pdf?index=trueIn PDF document text
    • http://nozozuwovore.atwebpages.com/search_engine_optimization_starter_guide_google.pdfIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_d766c0a0b3814889b3edafde2a3f7d24.pdf?index=trueIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_8a51790b54fe46c587d1dd0de44bcbe1.pdf?index=trueIn PDF document text
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_0f8853e78ac343c6be1023adfd9de1cb.pdf?index=trueIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_4f442f56eb024749bc57b2b0485deb21.pdf?index=trueIn PDF document text
    • http://wudazebej.atwebpages.com/cambridge_english_empower_b2_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc2bfb6b-71d9-4d88-993e-1a8b7462d32a/vekedojipigupitarokizuj.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_off0001050c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050C 5480 bytes
SHA-256: 21f8c1143e61826380f182facb111faa437f8a33c018a59d8a3cf54dd76b4aeb
font_01_sfnt_off000117a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A5 10992 bytes
SHA-256: 971f13c568883812729630d9d00adce5504b5ca6469c4005333485e4881653a7