Malicious PDF — malware analysis report

Static analysis result for SHA-256 27add109e50fcd2c…

MALICIOUS

PDF

78.8 KB Created: 2021-03-04 17:47:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7d5e1a24854e52d0f870e482c8d10cda SHA-1: ecbbf53eef67ebb3a7ebf445ed389f5ab189f334 SHA-256: 27add109e50fcd2c512e3e1af8aacb999ecc2f3cb7f0c74a54cdf7fbf3a5bd30
126 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'dafemum.ru/strik' which is likely the primary lure. The PDF's structure and the presence of external URIs suggest it's designed to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://dafemum.ru/strik?utm_term=waiting+for+the+barbarians+2020+review PDF link annotation
    • http://kixurox.getenjoyment.net/bedusadajutatizirodevade.pdfIn PDF document text
    • http://bufizuz.22web.org/vajamogu.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/Fhhihjf/lodagetoguwepalepebiwok.pdfIn PDF document text
    • https://cdn.sqhk.co/legezuseg/hdurahi/38469191410.pdfIn PDF document text
    • http://chambre.xyz/party_invitation_template_twinkl2lmd2.pdfIn PDF document text
    • http://homeolimp.com/706598555828ncjh.pdfIn PDF document text
    • http://tezoxefakalexo.sportsontheweb.net/convert_ms_project_gantt_chart_to.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/gjjg3dD/colorfy_coloring_art_games_app_store.pdfIn PDF document text
    • http://getcabinets.xyz/zulaxunekuxnnx1.pdfIn PDF document text
    • http://canlisohbetim.net/arnold_schwarzenegger_biographyt85jv.pdfIn PDF document text
    • https://cdn.sqhk.co/wedekimelol/jjObiev/mini_basketball_hoop_over_the_door.pdfIn PDF document text
    • https://cdn.sqhk.co/vedasukuki/jdiiehg/mens_short_haircuts_2020_thick_hair.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_bed802381ccd4fc28edb115cd2b56a2c.pdf?index=trueIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_4a40a0f772c446a48a0c9dda5e28a6d2.pdf?index=trueIn PDF document text
    • http://pizuzol.onlinewebshop.net/samsung_top_load_washer_drain_filter.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/pafasexosisapoxutugalile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71b1f586-61ea-4013-96a1-98fbec5acd40/hp_designjet_500_42_driver_windows_7.pdfIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_832956f1010c44bdb9ec81c7c43a4a5c.pdf?index=trueIn PDF document text
    • http://gazisemodab.epizy.com/cotton_bed_sheets_online_purchase.pdfIn PDF document text
    • http://wutaletuf.rf.gd/64623799531.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_e2f26813701d43ae9c88e230ba028544.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b2d9151-7c41-4c8d-9bd7-7fceb981036e/team_air_fl_studio_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a96129-d586-438c-a4a4-95ab9b16e2b2/39952223634.pdfIn PDF document text
    • http://didaduxazej.epizy.com/manual_auger_style_post_hole_digger.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_c6ee2830686f484fa43acdf753b3a897.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac390565-9dbe-476f-9bdd-b85c9f685b82/xovaganoselokigodu.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_off0000f662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF662 5576 bytes
SHA-256: 9fb062c05ecbdeefeb0e82b7ac83189310ad6ca229acd2f6976a351ca42101d2
font_01_sfnt_off00010976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10976 10372 bytes
SHA-256: d1aa44f8c1d3c7a886caa80b3513f7b7cb4d90146338ae734c8da18b4ad035e4