Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98ff26afec9f797…

MALICIOUS

PDF

79.4 KB Created: 2021-04-01 15:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6d70703ca6fe86f4790079cf5b84ef2 SHA-1: 893cf2576c7996a2712da62cc9e128974c3e3533 SHA-256: b98ff26afec9f79744f723d5ac51fee093c79bfd7cc0a9872b1c0011eb8b2cec
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with heuristics indicating a link farm designed to direct users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body and embedded URLs point towards a lure related to search queries, aiming to trick users into visiting compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/wix?keyword=the+giver+chapter+14+16+comprehension+questions+answers
    • http://umkatrade.ru/pc_games_to_play_with_xbox_controllerdck0w.pdf
    • http://radanews.site/vexafoxoj2921n.pdf
    • https://cdn.sqhk.co/dedizajo/jghrcji/demonic_gorilla_guide_2018.pdf
    • https://gejiraje.weebly.com/uploads/1/3/2/7/132740564/8735558.pdf
    • https://cdn.sqhk.co/lipetebo/0hhKBhg/banulewetonorikokakivegox.pdf
    • https://cdn.sqhk.co/jekurona/rfggidb/the_soong_sisters_movie_streaming.pdf
    • http://crysety.xyz/390443423554joii.pdf
    • https://lojigimab.weebly.com/uploads/1/3/0/8/130814508/doxapubaginu.pdf
    • http://znatural.space/sky_blue_background_images_hdyp778.pdf
    • https://cdn.sqhk.co/rolileduvof/5hhggc7/buy_twitter_stock_today.pdf
    • http://liketsven.xyz/half_an_anti_aircraft_burst_crosswordd1mec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fukepez/read_handmaids_tale.pdf
    • https://s3.amazonaws.com/baxekojojexusol/restaurant_guide_michelin_indre_et_loire.pdf
    • https://s3.amazonaws.com/tokudapele/20765878306.pdf
    • http://lizesurova.rf.gd/bizhub_c258_manual.pdf
    • https://s3.amazonaws.com/tutasujal/daxemuguvawubomolu.pdf
    • http://latosenepodukum.rf.gd/reaffirmation_agreement_form_for_student_loans.pdf
    • https://s3.amazonaws.com/jedaxopopuko/trane_cgam_chiller_service_manual.pdf
    • https://s3.amazonaws.com/zozuxukoxo/bloodborne_pathogens_test_answers.pdf
    • http://fobapisarut.epizy.com/22586938114.pdf
    • https://s3.amazonaws.com/xidazeze/northern_blotting_techniques.pdf
    • http://nebobabag.rf.gd/myers_briggs_online_personality_test.pdf
    • https://s3.amazonaws.com/zategafozasiru/43077006378.pdf
    • https://s3.amazonaws.com/gogunabones/pikuvenijokosoworudanigi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9bb.bin
ccf4410adc0a3b936e466fc823c889001b446dd80fc32a5c21478f521b55adcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 5716 bytes
font_01_sfnt_off0000fd2c.bin
5bb6452eb45e389c0b0351be337b614fb01e3a897af3feb28e837e883c2ef06b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 10620 bytes
font_02_sfnt_off0001216f.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1216F 4324 bytes

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