Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6e6751b8174d20…

MALICIOUS

PDF

79.8 KB Created: 2021-05-08 13:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d5e66d681be08f77ae2f2a38c936cfb6 SHA-1: 935628bdbe772d3cac5c15c21da970f2cdaad747 SHA-256: 9a6e6751b8174d205c2637566ab60e2f913541689a3641cad18002429243e723
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 0.9995

Heuristics 5

  • 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 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://midufefew.ru/strik?utm_term=what+does+it+mean+if+your+crp+and+sed+rate+is+high PDF link annotation
    • http://penexej.mywebcommunity.org/97353751917.pdfIn PDF document text
    • https://cdn.sqhk.co/satukevaguka/HibU2ig/69812181357.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/ijeicZk/3501147530.pdfIn PDF document text
    • http://itnegozio.info/811336459716lh8m.pdfIn PDF document text
    • https://cdn.sqhk.co/waxoxewanuvi/7Ahfgct/kudiruke.pdfIn PDF document text
    • http://widaget.22web.org/aparatos_del_cuerpo_humano.pdfIn PDF document text
    • http://comforfemj.fun/586262131881nrnw.pdfIn PDF document text
    • https://cdn.sqhk.co/gisatajofo/jeHjejg/54192263073.pdfIn PDF document text
    • http://bikupiribofaz.iblogger.org/wheely_7_game_for_pc.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://miwewugewu.atwebpages.com/explosive_ordnance_disposal_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b8c6b4f-8ebd-4548-a82d-7eeb7856f84d/28983568711.pdfIn PDF document text
    • https://de26864d-dd79-4a6d-8467-b5cf435a6969.filesusr.com/ugd/6ff07c_05d395360bbe4d2a8b0839aac4c3f04e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5975869f-27e3-48d6-b1a2-a8dee266fb79/causal_comparative_research_design_purpose.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/73813958587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c384c9be-47c4-4d66-9cff-7308960ad53b/best_singapore_math_curriculum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23c79c6f-bd02-4f28-bdf4-569c66dcff43/jersey_mikes_sub_in_a_tub_weight_watchers_points.pdfIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_eacf69416c8b4a47a18a5eae9f3f702b.pdf?index=trueIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_f2931b67077e4f53b8a139d5e7f91fa6.pdf?index=trueIn PDF document text
    • https://0c6b7a74-1ca0-41da-943c-c268a208a416.filesusr.com/ugd/fef373_134f613794124ac7a253486ae73d37a5.pdf?index=trueIn PDF document text
    • http://dogibini.rf.gd/radosaruxaxuvijififebodag.pdfIn PDF document text
    • http://zitupelu.epizy.com/74511093108.pdfIn PDF document text
    • http://vesuduw.epizy.com/ximobi.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_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 5536 bytes
SHA-256: 2682146d00666afe5d00d57cc04eb7416a540c8fc7f9c67f09690fb04a07e9c6
font_01_sfnt_off0000ffc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC4 10408 bytes
SHA-256: f046181b63631a6d3d48d0803180e0ee95bc65646af4a20896803b1250a00fff
font_02_sfnt_off00012370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12370 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3