Malicious PDF — malware analysis report

Static analysis result for SHA-256 b746761e04780f85…

MALICIOUS

PDF

74.8 KB Created: 2021-05-07 20:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5378aac1b6418e763453938b75d9e49 SHA-1: 6ac6593efec80e58c9f0cd3edf06b9a98b2bd717 SHA-256: b746761e04780f858b7eec14c2a83a0483b0fe5ef7846f6eb1c3c4f8106f0d10
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm or phishing lure. The embedded URL `https://jacksth.ru/strik?utm_term=anti+inflammatory+foods+for+gastritis` is likely part of this scheme to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=anti+inflammatory+foods+for+gastritis
    • https://cdn.sqhk.co/lomokubaf/fghifji/greenland_movie_streaming_canada.pdf
    • https://cdn.sqhk.co/kizafizutuw/jIV6YgP/99085748523.pdf
    • http://bobixuposu.22web.org/amsterdam_metro_tram_map.pdf
    • https://xesinuvukuwufo.weebly.com/uploads/1/3/0/7/130776104/befilezaxumom.pdf
    • https://vonorakukipi.weebly.com/uploads/1/3/4/7/134721252/robizokufosu.pdf
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/vuwuw.pdf
    • https://cdn.sqhk.co/tixuniwe/yprjggg/ghost_hunter_tomb_raider.pdf
    • https://cdn.sqhk.co/leruwexikud/fhgjijf/68238022072.pdf
    • https://kukitame.weebly.com/uploads/1/3/1/3/131379641/jixutixopa-raxudovoxowivav-bufajufido.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/52380105-8718-4b65-8aaf-67e27f1b23e0/can_you_put_juicer_parts_in_the_dishwasher.pdf
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_c0c3ea87f7074722b0383b6ef6cf9d6d.pdf?index=true
    • https://ab60d57a-1f92-408f-9079-0b325776b613.filesusr.com/ugd/724fb5_fb4a945cf1c54e248f3b559494a63092.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6e49313d-da89-49e2-9aad-0a8b71a35539/5914713963.pdf
    • https://uploads.strikinglycdn.com/files/3aa4ae22-dd11-4872-9282-6d18f67a19e7/how_to_critically_analyse_a_scientific_journal_article.pdf
    • http://bubilegire.epizy.com/zerorenuv.pdf
    • http://jabisuluro.epizy.com/download_bnf_2020.pdf
    • http://zatugawaxevi.rf.gd/mubazegemijipojadetewet.pdf
    • https://s3.amazonaws.com/jujadodedaruxix/nuvomidoxeva.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea21.bin
111008c37adcef768bc7ee2540d76bc98869356fd6c716480c441873cab7a191		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 5316 bytes
font_01_sfnt_off0000fc30.bin
3b4c01d276aa7be9828dd6bf51900126052b99d0a716103b1ab86772ea746ede		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC30 9876 bytes

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