Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec89a2f91b0e962…

MALICIOUS

PDF

78.7 KB Created: 2021-03-23 12:17:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 24369cdbd4102193959f99b1bf3c5b79 SHA-1: fbe7df924c6e2dc1bea1391f6bf5075f1cad3168 SHA-256: 1ec89a2f91b0e962e30f0e6cf7c7e2448002c5eb124adc70d5836d62c0312fd1
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware sites. No scripts were extracted, but the PDF structure itself is used to host numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://nipisod.ru/award?keyword=ahu+and+fcu+system+pdf PDF link annotation
    • http://beach-fruit.fun/what_is_the_gpa_requirement_for_mcgill_university2j98r.pdfIn PDF document text
    • http://xubozogafajus.22web.org/55169882156.pdfIn PDF document text
    • https://sokefumupuzezu.weebly.com/uploads/1/3/5/9/135991751/pumekil-xanawoxopavake-ziduz-mizotigila.pdfIn PDF document text
    • http://philonio.online/gta_5_3dm_activation_required5r9ez.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/ageEsji/72356816109.pdfIn PDF document text
    • http://copyright-helps-team.com/bojomoxesafonigegesuzolbtei.pdfIn PDF document text
    • http://stikc.xyz/dell_latitude_e6430_operating_manualkcyjz.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/ba1CNie/19439180114.pdfIn PDF document text
    • https://lojopozubog.weebly.com/uploads/1/3/1/6/131606756/9462295.pdfIn PDF document text
    • https://natufebopod.weebly.com/uploads/1/3/4/3/134305275/4e16abe7.pdfIn PDF document text
    • https://cdn.sqhk.co/sadudolamom/NjcBjaF/36067367750.pdfIn PDF document text
    • https://cdn.sqhk.co/dufelogaruf/4U18ZAP/67830248905.pdfIn PDF document text
    • http://woradegasuma.iblogger.org/how_to_perform_transcendental_meditation.pdfIn PDF document text
    • https://cdn.sqhk.co/jigijobofofa/iOifqhd/64199221713.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rakejobik.epizy.com/cad_electrical_blocks_free.pdfIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_689d9bd336444892bb4161fe6884b736.pdf?index=trueIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_c88bcc7de7d94fc9be6fe042e88f2bd0.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_12b8b4049a3f45dda3467345b3844e9c.pdf?index=trueIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_ac33f90e924a48919445307e556ed49f.pdf?index=trueIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_a96ebf9485d043f88b2bd6cb8156b70e.pdf?index=trueIn PDF document text
    • https://4461694d-a6f7-4a69-895a-ff5ddeb3c622.filesusr.com/ugd/f504fb_a6fae4501b474d39bd29c6864bf612b0.pdf?index=trueIn PDF document text
    • https://34570882-574e-4d25-8c0e-d8b9b6c2967f.filesusr.com/ugd/cb2bed_182683dab4134978a8f6d5808e1ffd44.pdf?index=trueIn PDF document text
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_fa5db7b34d2b4602a2c52a50a2681f0c.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_off0000f61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 5356 bytes
SHA-256: daa9eafedd98e4b462105e07065f505c569a39ce92551448063e6c8b51a6a7cf
font_01_sfnt_off00010841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 10872 bytes
SHA-256: 378956db96d3492ab66670c5545489933a6ad7d01265589741994b1b1cc3629c