Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63d12bab775fb30…

MALICIOUS

PDF

119.5 KB Created: 2021-04-09 01:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f65ca6bbda3e931d64e3791cd3334f8 SHA-1: 2506374bacf62594a1a68a06ac75e5649ef0fd8c SHA-256: f63d12bab775fb30b91307a303bbcf2bb8bcf08ddef5a8265a1681c277d0c60e
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 are disguised as PDF files, indicating a link farm or distribution point for malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains a title related to Tai Chi instructions, which is likely a lure to encourage users to click on the embedded malicious links.

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://kuzutuzo.ru/strik?utm_term=tai+chi+24+form+slow+motion+with+instructions
    • https://cdn.sqhk.co/divoxisig/jc9ieja/retro_city_rampage_dx_wiiware.pdf
    • http://bcpzonasegurape2-viabcp.com/didujosl1ev.pdf
    • http://dvigatel.guru/nuevo_uniforme_de_carabineros_de_chile9iefh.pdf
    • https://cdn.sqhk.co/babijuvawov/6FdievM/toasted_sandwich_maker_target.pdf
    • https://cdn.sqhk.co/duditizonut/jgfjbDo/nezofelejosafogis.pdf
    • http://fragcups.com/xezisefa1bwk8.pdf
    • http://moymagazin.xyz/fenilerikadujamipusu6b0v.pdf
    • https://cdn.sqhk.co/baruduwege/yNdHiie/video_poker_trainer_app.pdf
    • https://vinusipiwa.weebly.com/uploads/1/3/1/3/131381721/3cb9623b10.pdf
    • http://profyhouse.ru/master_of_orion_2020yjl7o.pdf
    • https://bizitaninajoki.weebly.com/uploads/1/3/5/3/135316521/mopaxu-vijaritu-jifamobaxi-gugejakaxu.pdf
    • http://idealica-uficialeitalia.website/anti_ragging_form_aman_movementq9g11.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_5558f1626fda445f9122febf4917e8e3.pdf?index=true
    • https://c63ca81c-6df4-4ec3-bc2e-8508f29a6879.filesusr.com/ugd/d48fe3_56b828fe76b7419dab41bec295d4e74e.pdf?index=true
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_8ff50407edd64bd6829b74d13b2f2978.pdf?index=true
    • https://70745723-7f4a-4dc7-98be-95bdce43cd82.filesusr.com/ugd/67bae7_07ce5845be9749a4af15091b843d9a03.pdf?index=true
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_735ae8139b254ad1bbd010a57a7301ed.pdf?index=true
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a5b.bin
c014cabd21b42ed5846894e3fc2895dfffc4591f2c0ac9ed209268236f0c3d36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5B 28956 bytes
font_01_sfnt_off00018439.bin
762dcb5ccae8c4e140cf69687123f369dd32f5696249432e925e825720e9630d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18439 5144 bytes
font_02_sfnt_off0001959d.bin
8afd47f0d0e636713a3f76e17528573d2f64ec1df35c7e7ead7226b12390a94c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1959D 14672 bytes
font_03_sfnt_off0001c229.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C229 4324 bytes

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