Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec45519ce55f26a9…

MALICIOUS

PDF

81.1 KB Created: 2021-03-16 10:54:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c0a6e6926084258af77b5e90aa8d2574 SHA-1: 104e26d79ef7e2e4ba4903e2bfc6427f5867f2c1 SHA-256: ec45519ce55f26a958d36e4c830af645321f59294260ce15c95101e940c8d4f7
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains a large number of external URLs, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to potentially malicious content. ClamAV also detected it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/123?utm_term=truck+bed+size+guide PDF link annotation
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/kazavito.pdfIn PDF document text
    • https://cdn.sqhk.co/sawijewabob/YjjIjhL/l_agriculture_urbaine_en_france.pdfIn PDF document text
    • https://cdn.sqhk.co/navififoro/ghnhahd/tusubavemumanewumo.pdfIn PDF document text
    • https://cdn.sqhk.co/nokulebepoba/hacIid9/raxunejapotamakeno.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/58600606518.pdfIn PDF document text
    • https://poxovoxi.weebly.com/uploads/1/3/5/3/135398301/jenerobavifefe_gakirovokozifak.pdfIn PDF document text
    • https://cdn.sqhk.co/godajaxox/bieSehc/39870528882.pdfIn PDF document text
    • https://jozevupipe.weebly.com/uploads/1/3/5/3/135346753/3078527.pdfIn PDF document text
    • https://cdn.sqhk.co/laloropaki/smvheyU/lerewezuvurasip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://temekerujaniva.rf.gd/xepupamu.pdfIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_0a5cb31aaad1472981ef86d66fdc6c80.pdf?index=trueIn PDF document text
    • https://ea64ff4c-51e6-4efc-8cc1-399682447901.filesusr.com/ugd/961f18_cc0564e314504a5683908950b0100e70.pdf?index=trueIn PDF document text
    • http://sopavame.onlinewebshop.net/acca_f9_kaplan_exam_kit_free_download.pdfIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_17d00352e1cc45a3964c8978faca81a0.pdf?index=trueIn PDF document text
    • http://vubixegigag.rf.gd/fafex.pdfIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_245a4055a6114ef79168eb408fe84848.pdf?index=trueIn PDF document text
    • http://jemileti.atwebpages.com/13298882519.pdfIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_560875809662468cb8fe97c2ad82f78b.pdf?index=trueIn PDF document text
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_a07f826e102e421a9ecf34903336cae5.pdf?index=trueIn PDF document text
    • http://xefokezutuvij.epizy.com/rockstar_movie_ringtone_pagalworld.pdfIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_9b614f0405cc4d27adaf32322b95cb68.pdf?index=trueIn PDF document text
    • https://ba789de2-c385-43ee-b32d-a34c698d1993.filesusr.com/ugd/b7082a_8571fe70f6514e4e883a30edc26b3ce6.pdf?index=trueIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_d370a9a4cf4b43ef96e6a636577f9a4d.pdf?index=trueIn PDF document text
    • http://ruxurosagogaru.epizy.com/39159698374.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 4656 bytes
SHA-256: 2bac50493d496746352768aefe16202cdc74e17b2f3ec457e7dd3ddb1c2f21db
font_01_sfnt_off000103d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D3 10952 bytes
SHA-256: 0c178817c73c8e2dfb1371b0d0f2fc900feb5541b0f5f0ae82b8a77de7407556
font_02_sfnt_off00012925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12925 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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