Malicious PDF — malware analysis report

Static analysis result for SHA-256 97564597e8f56cac…

MALICIOUS

PDF

77.7 KB Created: 2021-04-02 13:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f37fc922ba4f4f52f57634617a697cc SHA-1: 91e84ef1e188d917bcd58b34b47d411226ab570d SHA-256: 97564597e8f56cacfd5d02d6f28a5df665bf82e9a28073d14bf96161cf017dc2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=the+literary+guide+to+the+bible+pdf
    • https://cdn.sqhk.co/ributexovek/ifjeOgi/laxerubopipisixil.pdf
    • http://tuwasukam.getenjoyment.net/aeroponics_lettuce.pdf
    • https://cdn.sqhk.co/nemalerute/hbjgih7/virtual_families_2_iphone_cheats_money.pdf
    • https://fuxakenaz.weebly.com/uploads/1/3/4/5/134589300/komat_gopir_vojuroxave_fajijikonumag.pdf
    • https://cdn.sqhk.co/sosexazefip/jcjigcd/mejigemumibejozuse.pdf
    • https://xirejefeju.weebly.com/uploads/1/3/4/7/134723985/votupoturaxaka.pdf
    • http://rumurel.mywebcommunity.org/audio_driver_for_windows_10_64-bit_-_lenovo_g580.pdf
    • http://todolosepaxo.iblogger.org/how_many_calories_in_a_4_for_4_wendys.pdf
    • https://cdn.sqhk.co/gudijupimeb/hhCjwje/jotojodujulolejatiwakub.pdf
    • https://jexewibovagajuk.weebly.com/uploads/1/3/4/4/134485971/birixenepejudiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_48ab19b6f74e4232945652231a998ba7.pdf?index=true
    • https://8f1ef4f7-3f23-41ef-a3d6-4e5873a175a2.filesusr.com/ugd/d318ce_78163e2850204081ad5f410497e1cca4.pdf?index=true
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_9179d22e9d2948feb69c87006e77020e.pdf?index=true
    • http://judixipe.epizy.com/customer_survey_analysis_report_sample.pdf
    • http://vosimamasi.epizy.com/tovomogidimiwilurun.pdf
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_5f779ca552af4363b90526174e7cc7b2.pdf?index=true
    • http://kogasalilim.epizy.com/arbeitsvertrag_teilzeit.pdf
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_8ec18b5a57134df68e93c892108a6e04.pdf?index=true
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_f4db87348be74df2afe07511991c1cd2.pdf?index=true
    • http://xedavabawavela.onlinewebshop.net/6202804202.pdf
    • http://jukopofavim.epizy.com/how_to_know_if_peer_reviewed_article.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_off0000f16e.bin
c465cdc9cff37d379c77e862b1ff10a17de56f1ba8df1fe17da6e84f1f058812		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 5316 bytes
font_01_sfnt_off00010381.bin
f1a7b53e4472a8ce525bba036c3a2e43a8f38b3ad35f6228dd2538f07af43ffb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10381 11224 bytes

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