Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a733120d84f995c…

MALICIOUS

PDF

75.1 KB Created: 2021-03-14 22:19:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f65ff50d7ada2bd52228ea4d0516467 SHA-1: 2b99bb71488201179811560dc5ee38d052147473 SHA-256: 8a733120d84f995c3e388802c9084372de3f8c67fb8e2d4e8c62f0c1b837088c
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 domains, indicating a link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' specifically flags the mass external PDF link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=puppy+store+near+walt+whitman+mall
    • https://cdn.sqhk.co/mitugejaxel/R3jgIgf/66379320630.pdf
    • http://g2am2e.xyz/police_crime_simulator_superhero_gangster_killedu214a.pdf
    • http://levotavo.scienceontheweb.net/84529314373.pdf
    • http://zujewubowufonug.scienceontheweb.net/matlab_simulink_documentation.pdf
    • http://policyhelpcenter.com/65954989938o6xol.pdf
    • https://cdn.sqhk.co/towinomer/77oOjhj/meaning_of_talismanic_magic.pdf
    • https://cdn.sqhk.co/kusamika/jhHehi6/bubble_tea_popcorn_tong_garden.pdf
    • http://napowojeba.medianewsonline.com/good_persuasive_speech_topics_for_college_students.pdf
    • https://cdn.sqhk.co/wosinuwukabu/jbIo16m/palovoxura.pdf
    • https://cdn.sqhk.co/wamiratena/uigNWjc/piseniwogukoxatikojamiz.pdf
    • https://cdn.sqhk.co/rujiwujik/heEeMtG/tebeduvuk.pdf
    • http://accueilcmb.com/sih_problem_statement_formatxyw0m.pdf
    • https://cdn.sqhk.co/vakolitakap/hdAUhht/wedding_cake_topper_surfer_and_mermaid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/dojonuta/bahubali_2_odia_video.pdf
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_055290ca1d1444928723b62dd550bff5.pdf?index=true
    • https://s3.amazonaws.com/wipotegadodorek/mas_holdings_annual_report_2015.pdf
    • https://s3.amazonaws.com/vososasoxumete/86770517283.pdf
    • https://s3.amazonaws.com/ropuba/nikesamuzixosofutuj.pdf
    • https://s3.amazonaws.com/xirixepo/wen_56200i_2000_watt_inverter_generator_reviews.pdf
    • https://3c8d80e7-2998-4b53-b1db-ea2053e4eee2.filesusr.com/ugd/5c8c55_431ae09195d242779cb5696b67204f28.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da03.bin
9f3ccda290c28d2bdaa47134ee62fdad5a7f5dbdae7c9950d20c35a0285cce94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA03 5136 bytes
font_01_sfnt_off0000eb57.bin
a7d48078b51eea65ace39675c44d6f331bc9f443efc198edb712769ac78373b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 10384 bytes
font_02_sfnt_off00010f12.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F12 4324 bytes

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