Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a5ac0cd4e493dd…

MALICIOUS

PDF

79.1 KB Created: 2021-03-07 23:16:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 88ede83ef34a261b9d033809c2c83cdf SHA-1: 59c1b6ab53311a090ce85c083cf5d2ef2590ccf3 SHA-256: c3a5ac0cd4e493ddfb47959d5fb2ddb0f7fc0f242421e26f6ec8ad669066f0e8
166 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of external URIs and a link farm structure suggests an attempt to redirect users to malicious sites. The heuristic 'SE_LOLBIN_RUN_COMMAND' indicates the document text may contain commands or references to executable content, potentially for exploitation.

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://xajibur.ru/wix?keyword=last+day+on+earth+bunker+alfa+code+april+2020 PDF link annotation
    • https://tinuxitimo.weebly.com/uploads/1/3/4/7/134748051/24afa749cdba9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_60391cb6ba62b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392667/normal_6012175c8a776.pdfIn PDF document text
    • https://xuwogufovesuvem.weebly.com/uploads/1/3/1/4/131406895/pawivamurilun.pdfIn PDF document text
    • https://raponomipa.weebly.com/uploads/1/3/2/6/132681826/cef8979e7.pdfIn PDF document text
    • https://cdn.sqhk.co/wenejusuzixe/ihhigd9/final_fantasy_tactics_war_of_the_lions_switch.pdfIn PDF document text
    • https://cdn.sqhk.co/xavaxonad/ijuoggg/twitter_search_ban.pdfIn PDF document text
    • https://cdn.sqhk.co/dojidavos/jixhcGR/kikigotudibadevitizonifut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370764/normal_602836d01325e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458161/normal_60167e3895345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploadsIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/78516d4e-5432-4442-a22a-f2c23674cf1c/the_divergence_of_a_curl_is_always_zero.pdfIn PDF document text
    • http://wotikuvejuf.rf.gd/introduction_to_the_theory_of_computation_solutions_3rd_edition.pdfIn macro / runtime command snippet
    • https://2a085669-a8dc-40eb-b1d3-71ea9d660f60.filesusr.com/ugd/cafc24_eac788a184bd4b98b7f67035401bec7a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/87415054-b3a2-45f9-95ea-5714b1d8d868/without_regret_synonym.pdfIn PDF document text
    • http://mojabumenir.epizy.com/fovemiwiliwarefoxep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cfef45b-bff0-46d2-84c5-3c873fc400fa/hansel_and_gretel_story.pdfIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_56dfc754e754463383c0e71bf1b49422.pdf?index=trueIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_85901a5f3b2844abb3ac96fd90c27620.pdf?index=trueIn PDF document text
    • http://moxogojokerop.rf.gd/68097192996.pdfIn PDF document text
    • http://tugujaxozulir.rf.gd/58634637887.pdfIn PDF document text
    • http://newokej.epizy.com/call_me_by_your_name_script_analysis.pdfIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_b2889b8f16e44bd6be26f99d32064395.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_off0000f7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A9 5764 bytes
SHA-256: 0c342b28ebb9ec741065fb887511df444ad26906d2b6fbde6b0e9ba5b0b48444
font_01_sfnt_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 10472 bytes
SHA-256: c4b7b29c96f99699ca3f9d114b59f84c85b3a36d4c105889eaeacbadf2aa3ce5