Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb734fb9e242d97…

MALICIOUS

PDF

83.5 KB Created: 2021-03-16 03:14:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1194dd4ccb0543808eab0291e7b81ef8 SHA-1: b98abd0d9db5382a02a31978d2cc502a111305f3 SHA-256: 9cb734fb9e242d973d6561d818ee8f8dd2a157f5e67983065ef943dd21324b33
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 domains, suggesting a link farm or phishing operation. The embedded URL 'https://pelibifir.ru/wix?keyword=accelerated+reader+answers+quizlet' is a primary indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/wix?keyword=accelerated+reader+answers+quizlet PDF link annotation
    • https://cdn.sqhk.co/jinubodilev/hbI6geC/mudelax.pdfIn PDF document text
    • http://tajuliwelofiti.medianewsonline.com/14635535575.pdfIn PDF document text
    • http://janafan.scienceontheweb.net/5745011971.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/Ojiip6l/metal_slug_anthology_ps2_vs_ps4.pdfIn PDF document text
    • http://ginupedarokuxu.getenjoyment.net/bluedio_t4s_manual.pdfIn PDF document text
    • http://zarewubizeno.mywebcommunity.org/fender_fuse_discontinued_reddit.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/hx6Osgz/simulator_usa_2.pdfIn PDF document text
    • http://vifezitenof.getenjoyment.net/sociology_as_a_science.pdfIn PDF document text
    • http://lezepubaj.iblogger.org/cutting_edge_intermediate_student_book_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/bikegola/Qgejbgf/perimasurizotexa.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvuvidova/gYMeFje/navobikodifufes.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
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_b0fb6984f5a54fd486285309e68162b8.pdf?index=trueIn PDF document text
    • http://gevejonitu.onlinewebshop.net/how_do_i_use_my_phone_as_a_remote_control.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a29956da-f2d2-47dc-ba6f-b406a1ddeef7/45763280887.pdfIn PDF document text
    • http://sibubixusa.epizy.com/25432006313.pdfIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_fb413f441d8e470a993fa0b05392e4af.pdf?index=trueIn PDF document text
    • http://pasabepudibupe.epizy.com/junugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2770a5f8-2367-4db1-8e46-8422fed80ac7/wands_of_horus_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/876e40cd-6b2e-40e5-8cb0-7c8349a3f515/foscam_fi9900p_v4_firmware.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_off0000fb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 4960 bytes
SHA-256: 04389def3fe13a746ebf1f46beab6807ff29e942c50068a9c194a9d55b8de759
font_01_sfnt_off00010c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5A 11324 bytes
SHA-256: 6a6d54b23cdfe546971d816ed8afbdc9fd8eb1c757a73325766f4ff15964ce39
font_02_sfnt_off000132a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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