Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3961a815f310d9…

MALICIOUS

PDF

77.3 KB Created: 2021-03-22 13:53:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ae551c862dcb1ae039678ced86884212 SHA-1: 1a730e936f7a4cb10c0eecede136d8cc200b57fc SHA-256: 2a3961a815f310d96ba2bf635ae138d19e970f6aa4f40878ac46add4e99821c4
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://soxebez.ru/award?keyword=adjetivos+demostrativos+frances+pdf PDF link annotation
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/mosijonobezez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470232/normal_6037b85e44dee.pdfIn PDF document text
    • http://uptodate.site/34671908128mdc8e.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusetoteji/ihihTon/4352821006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417814/normal_5fd1972639acf.pdfIn PDF document text
    • https://fefedajukuda.weebly.com/uploads/1/3/1/0/131070841/2575690.pdfIn PDF document text
    • https://sudefenumub.weebly.com/uploads/1/3/5/9/135984534/9b478da971266.pdfIn PDF document text
    • https://cdn.sqhk.co/kavuluxaja/dFWijxA/car_crash_test_simulator_3d_leap_of_death.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482208/normal_602725bb1a01f.pdfIn PDF document text
    • https://geregilewupune.weebly.com/uploads/1/3/4/8/134849809/9515594.pdfIn PDF document text
    • http://megantv.site/panasonic_plasma_tv_42_inch_specs20ytl.pdfIn PDF document text
    • https://cdn.sqhk.co/tifapoxur/jjAghjh/65755219398.pdfIn PDF document text
    • http://nikaold.site/magiccall_voice_changer_app_pro_apk58qb3.pdfIn PDF document text
    • https://vokesilito.weebly.com/uploads/1/3/4/4/134400786/kazawitipi_godofagomoxixo_zelagomako.pdfIn PDF document text
    • http://firstsecu-paypal.com/sukibuzutezilojifinyhanq.pdfIn PDF document text
    • http://tugrull.com/mifob44c64.pdfIn PDF document text
    • https://debamivuk.weebly.com/uploads/1/3/1/8/131871977/kukokabi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480142/normal_5febce35e197a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421639/normal_6026a8c6cb4f8.pdfIn PDF document text
    • https://zipobirin.weebly.com/uploads/1/3/5/3/135386694/b1dd62ecf5d472.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_172d8e7239d34facb462e0b710ec2ef2.pdf?index=trueIn PDF document text
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_e01900a47c6d4e39abb939adc3cc1040.pdf?index=trueIn PDF document text
    • https://7ef5d8b8-74ac-4e0a-b0a0-fa61ca6462a8.filesusr.com/ugd/23e9be_408020751783461d8a399585bd542be5.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7ED 5396 bytes
SHA-256: ed4aa4221296c434397d04c7b7ec249760d2f4954629761c4bac021cf876f2c7
font_01_sfnt_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 11588 bytes
SHA-256: fba658334370f7a592cd74e8d97b22e23ed47195fa158467b0d6098ea1d586bf
font_02_sfnt_off0001107d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107D 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501