Malicious PDF — malware analysis report

Static analysis result for SHA-256 d178011e2d1cae05…

MALICIOUS

PDF

103.2 KB Created: 2021-06-12 23:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: b6123a0d4416ed98e5454a89ae511b38 SHA-1: dfca2110795e25c7c98b92f9f4ed701b573eef36 SHA-256: d178011e2d1cae05f8562ed4bc991c55e9cc4f5049af8ca72c74602586c5bb54
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 0.9985

Heuristics 6

  • 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.
  • 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://coretry.ru/pbw?utm_term=chapter+7+market+structures+worksheet+1+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4402717/normal_5ff831259f4c2.pdfIn PDF document text
    • https://rowigimafusapop.weebly.com/uploads/1/3/5/9/135982222/fb6a4eb8.pdfIn PDF document text
    • https://nivakodet.weebly.com/uploads/1/3/4/3/134330266/ccc8df0bb7c.pdfIn PDF document text
    • https://pezibufanijazox.weebly.com/uploads/1/3/4/6/134639202/6515115.pdfIn PDF document text
    • https://xozokixuz.weebly.com/uploads/1/3/4/5/134587908/bixudifokigezakav.pdfIn PDF document text
    • https://wokegoje.weebly.com/uploads/1/3/4/0/134040701/kejikenikojunatuv.pdfIn PDF document text
    • https://timurikamaz.weebly.com/uploads/1/3/1/4/131406182/gepebunabad.pdfIn PDF document text
    • https://gepolurur.weebly.com/uploads/1/3/4/6/134610134/113016.pdfIn PDF document text
    • https://pijewiki.weebly.com/uploads/1/3/5/9/135966210/eaf7a.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4483591/normal_60b6e47b4b483.pdfIn PDF document text
    • https://vozutububedem.weebly.com/uploads/1/3/4/3/134372478/98cc497d9b28.pdfIn PDF document text
    • https://mibajajezek.weebly.com/uploads/1/3/4/0/134017497/174aafada55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443371/normal_601c650e508d9.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/736f205c-0324-45ea-b629-042666c405a7/17268327853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9df4aaef-6ee9-4290-86e8-47da3b07ae1d/ronco_food_dehydrator_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84efff8b-312e-4eec-9128-3332717d03cc/how_to_sign_up_for_obamacare_in_arizona.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/f/comparative_adjectives_exercises_advanced.pdfIn PDF document text
    • http://patimedudemu.pbworks.com/f/47148531430.pdfIn PDF document text
    • http://gebetedoke.pbworks.com/f/xaruro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d57cfc01-0599-4b16-a37a-94e378985ffa/what_is_the_best_4k_android_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86baaf9f-fcf1-435d-a6da-3ec872b503aa/lozemoxita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08ddfc41-5e15-4602-8bb9-7ebfa9e095e6/whirlpool_refrigerator_not_cooling_or_freezing.pdfIn PDF document text
    • http://tezalef.pbworks.com/f/mechanical_drawing_board_and_cad_techniques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18cd90be-d10a-4946-a6b5-53ab68ff8438/classics_of_philosophy_3rd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf37b20b-7604-405d-8c49-71c2fc13310e/que_hago_si_mi_media_naranja_es_toronja_resumen.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_off000154d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154D2 5436 bytes
SHA-256: 926688f4dc6b2cffd8f2891d0238103854226e123e5c6ce98be11785a8f55c7c
font_01_sfnt_off00016744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16744 11512 bytes
SHA-256: d6093351304d1e5f3c3cb1ecdb7804578abe20579d00bf47bb3657b3961d3d21