Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a99f7c5699f9e30…

MALICIOUS

PDF

123.0 KB Created: 2021-04-01 03:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0025cb8ec98f19de03d2e0625a0c77cd SHA-1: 562c45232c0e80bd11ee5980d3d3206ce47f3d7e SHA-256: 6a99f7c5699f9e30c80af74951bd15d374d9409635cbeff1d739e207d9289ad8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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 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://resalured.ru/wix?keyword=buy+cigarettes+online+nyc PDF link annotation
    • http://medgaj.com/hava_nagila_sheet_musicvjhii.pdfIn PDF document text
    • http://verifiedbadge-lnstagram.com/57183429991jyii9.pdfIn PDF document text
    • http://levelupguild.com/40626653897vxn8p.pdfIn PDF document text
    • http://italywow.space/69923658445nui5f.pdfIn PDF document text
    • http://goldstein.berlin/kozuvovisixakuvupg3q9.pdfIn PDF document text
    • http://nexekeb.iblogger.org/75167941869.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://mon-fortuneo.best/2415825745xecev.pdfIn PDF document text
    • http://repipugokujo.iblogger.org/lajasigutofapo.pdfIn PDF document text
    • http://fimewot.xyz/mokidrmgsk.pdfIn PDF document text
    • http://soldonlakewood.com/electrician_training_booksu6mad.pdfIn PDF document text
    • http://vosalax.22web.org/56764752377.pdfIn PDF document text
    • https://cdn.sqhk.co/kosojilufut/djiidrc/elite_european_mobile_mechanic.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/icmcuKh/missiles_meaning_in_urdu.pdfIn PDF document text
    • https://cdn.sqhk.co/bevizewo/jf0qii3/rc_car_simulator_controller.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://molamizaxe.epizy.com/what_words_should_not_be_capitalized_in_titles.pdfIn PDF document text
    • http://dinikuwaduvo.epizy.com/francis_lai_love_story_piano_sheet_music.pdfIn PDF document text
    • http://xugadizedema.rf.gd/15813826619.pdfIn PDF document text
    • http://sapoziwuzodol.rf.gd/how_to_break_forces_into_components.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000196bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196BF 5000 bytes
SHA-256: b2beee7192f6462e655ec6cce9121f8434d5e38a2faa8bbbb44c20c175a28303
font_01_sfnt_off0001a7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7D4 11288 bytes
SHA-256: 7a4c8a284feb6297efb0cdd1b69151a4225217a0a1abb63546957792bbd1135a
font_02_sfnt_off0001ce83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CE83 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34