Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b74420e4b62ecc…

MALICIOUS

PDF

79.7 KB Created: 2021-03-30 12:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c5d511a6895866c20db295523c55746c SHA-1: 9a04c4994ebeb3c29804f0c624bf061649bb8ea5 SHA-256: 99b74420e4b62ecc3b807f5932663b1909946e60c6c9c478a80728459e0c15b0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM'. The primary external URI points to 'https://jumiwimov.ru/123?utm_term=vpn+untuk+android+box', suggesting a lure related to VPNs for Android. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jumiwimov.ru/123?utm_term=vpn+untuk+android+box PDF link annotation
    • https://gusumumonabol.weebly.com/uploads/1/3/0/7/130775475/sevoduvenujezixadej.pdfIn PDF document text
    • http://bowofonu.22web.org/briggs_and_stratton_16_hp_service_manual.pdfIn PDF document text
    • https://vobogokofudukig.weebly.com/uploads/1/3/0/7/130775751/wasifi_mixos_lokexotate.pdfIn PDF document text
    • https://lozugukavokukes.weebly.com/uploads/1/3/4/3/134357100/jubibijasuf_lerovubapox_saredowadelo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/action_game_recorder_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/14261213089.pdfIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_0052f0c3f3284d8986a4f14f94d295f2.pdf?index=trueIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_d82adfd023c64887b55bd67275b22efd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/latufenaw/epf_c_form_free.pdfIn PDF document text
    • http://jekowatu.epizy.com/59695096457.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/curriculum_guide_in_filipino_11.pdfIn PDF document text
    • http://pijopatamotawu.epizy.com/fakuj.pdfIn PDF document text
    • http://toledufebemal.rf.gd/85481509187.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/18767115596.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/6463431559.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/call_of_duty_pc_garena.pdfIn PDF document text
    • http://vipupirewikome.rf.gd/iphone_user_guide_for_ios_8.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/70368500025.pdfIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_85afaa53cd574f82950b344ad949ab42.pdf?index=trueIn PDF document text
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_c000e5658f82425fadea4aaadba7464f.pdf?index=trueIn PDF document text
    • https://eb9d0a7c-f241-4274-9260-18def620c3fd.filesusr.com/ugd/796b85_bf950e4a90b1402383fdc3ba16f05d25.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gonima/53288829723.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/marlin_test_question_and_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/modern_family_episode_guide_season_11.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/anjali_songs_free_starmusiq.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA55 4980 bytes
SHA-256: 9f97989571c9038289b950b5ceb2d42c4e5d55908048242df3e50a38259a4e7c
font_01_sfnt_off00010b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B52 11236 bytes
SHA-256: 75f721a47a6563f269d44fc8b0d81939974641027a6ffdb14cb2c08f14d196cf

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