Malicious PDF — malware analysis report

Static analysis result for SHA-256 7accfed4fdc6e46d…

MALICIOUS

PDF

74.4 KB Created: 2021-03-19 05:03:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65f9b863fae741f3d63fc3f512a3128b SHA-1: 70dfce788a282e43cdc60d9551427b1a374b85be SHA-256: 7accfed4fdc6e46d844e17c5d88d372669c8e279dce5614109032946b8e93b6c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious or unknown domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malware or visiting malicious sites. No scripts were extracted, but the structure itself is indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://botokaw.ru/123?utm_term=periodic+table+pdf+detailed
    • http://meetsoda.club/3007923549r57g1.pdf
    • https://lofemeraj.weebly.com/uploads/1/3/2/8/132814933/389ad5d8e9.pdf
    • https://fovubimosifiwu.weebly.com/uploads/1/3/4/3/134324820/fonazozaxawe.pdf
    • https://bigikudas.weebly.com/uploads/1/3/0/7/130775628/sobawopibubabes.pdf
    • https://cdn.sqhk.co/xadeviro/blgijfK/lokevelimozixo.pdf
    • https://cdn.sqhk.co/tenalewi/jhifCLv/brawlers_voice_for_brawl_stars_apk.pdf
    • https://ranilabat.weebly.com/uploads/1/3/5/9/135999147/9649425.pdf
    • https://cdn.sqhk.co/zapimafe/jIghKT4/miwarubetod.pdf
    • https://cdn.sqhk.co/rinugezig/LigtAL7/sezafibarutad.pdf
    • http://itdomen.fun/10822188120gt7gx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_23df29ffd59145f499f60e08c52cc580.pdf?index=true
    • https://s3.amazonaws.com/jiwisi/schneider_electric_mcb_catalogue.pdf
    • https://uploads.strikinglycdn.com/files/ed0a7b7c-4eda-4b46-a2a2-0109682beb2a/4_pics_1_word_answers_5_letters_level_81.pdf
    • https://e924225a-aa46-4bfc-8e56-7341551e1833.filesusr.com/ugd/54dfea_72a47abc47df4779bc9cfd9bbdb0662a.pdf?index=true
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_68cadb42ca5549a59ba68dbe1142ff18.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c2ba2107-db93-4e11-b77b-29d506ba5716/mulugifuxedexokuse.pdf
    • https://uploads.strikinglycdn.com/files/e989f4c4-82dc-4de1-a536-97e3752d11d8/speedlite_580ex_ii_manual.pdf
    • https://uploads.strikinglycdn.com/files/653649c2-7d69-49cf-bb69-6d2830f8b47b/sesegutumizuwelo.pdf
    • https://s3.amazonaws.com/miwolezedubujoz/lavurumelovivufe.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_off0000e531.bin
96c7ed739434b14301a63f7336702b1df0cf23ab93c3d1f922bd06af67192feb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE531 5112 bytes
font_01_sfnt_off0000f69d.bin
10c5a1bdb8a6eb4b23bc7bd292ed4cbac67f8ddd80d5e71dd32f41dcf3a01210		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF69D 10580 bytes

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