Malicious PDF — malware analysis report

Static analysis result for SHA-256 397b8c5512182f31…

MALICIOUS

PDF

78.4 KB Created: 2021-03-21 22:57:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 674652351adc6338a0960b508a419658 SHA-1: 5970d79616902f37b844810dedbae0227d6dff3f SHA-256: 397b8c5512182f3186c2e3b5404759e343d57b669516f63ee82e48f59cec129f
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 0.9957

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://golowaki.ru/strik?utm_term=how+do+you+really+win+the+powerball+lottery PDF link annotation
    • http://lamaded.mywebcommunity.org/pediboponebubugama.pdfIn PDF document text
    • http://nakijeku.mygamesonline.org/coffeescript_tutorial.pdfIn PDF document text
    • https://cdn.sqhk.co/sirijunubi/kuuhgnM/992_turbo_s_drag_race.pdfIn PDF document text
    • http://malespw.xyz/xosiwigiwutasvlu07.pdfIn PDF document text
    • http://raicen.com/92284468900colkq.pdfIn PDF document text
    • http://zotusomadelisok.22web.org/zoguluwino.pdfIn PDF document text
    • http://fogenuwudurejo.iblogger.org/dufariravawuder.pdfIn PDF document text
    • https://cdn.sqhk.co/xegapanasa/g6gjcyA/88548039119.pdfIn PDF document text
    • http://rexapeduke.66ghz.com/16734142099.pdfIn PDF document text
    • https://cdn.sqhk.co/potasuregoz/ThiGdgf/juxulidofax.pdfIn PDF document text
    • https://cdn.sqhk.co/pegidago/ibDZGBY/thames_water_customer_assistance_fund_application_form.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/how_to_scan_multiple_pages_canon_mx490.pdfIn PDF document text
    • http://zeropium.com/71842127511yurm2.pdfIn PDF document text
    • http://bumufirila.mygamesonline.org/8773395499.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/7uhjNgg/kiss_of_war_sniper_ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a7f5201-08f7-4cc7-9ac6-dc49cbbd0704/apc_smart_ups_700_battery_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed4fd17c-596a-4bbf-aea4-f05cd1a3d450/65761423081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46dbfc54-3f8c-484e-8338-59e05e7081e1/75860687035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e450a44d-7e44-4fd9-a302-4eb89ac478f5/best_offline_basketball_games_for_ios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e411521-15bc-4227-bd43-db0937539a54/crosley_c6_turntable_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ced88b11-5e61-4575-96dd-05415e8917cf/basketball_dribbling_drills_for_middle_school_pe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad4ecd2c-37df-4642-b521-d6464e3aff2e/22361297420.pdfIn PDF document text
    • http://nujugeteteda.myartsonline.com/john_paul_jackson_warning_dreams.pdfIn PDF document text
    • http://mowumaja.epizy.com/nufavekilobajusozofosovep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b011a4dc-d0bb-45da-851f-c27072353a83/luwora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4370dc1a-4a6b-4fce-a05a-3e62c5d7f676/bularilezupatusolepedolu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fd95661-7dea-4d06-be9e-111e5e75ed59/how_do_you_know_if_your_smoke_detector_is_working.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_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 5164 bytes
SHA-256: 885eac33f8afe9e225437e9c979b38447ee67531a72edbcd4996e3040be08060
font_01_sfnt_off000103b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B1 11420 bytes
SHA-256: b4feb4837e319d085406222140d4692422bcb515e2d743d6e141f71b924ad1e4