Malicious PDF — malware analysis report

Static analysis result for SHA-256 177373b6f71adb2e…

MALICIOUS

PDF

83.0 KB Created: 2021-06-07 08:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 58b10273dedf16d8677e0c04a502a0ec SHA-1: b38aaac0b8b696df260528722f166f4d6ac86944 SHA-256: 177373b6f71adb2e758f87b2661c13171a2278d811ee325763f8d12528c47905
134 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an external URI pointing to a suspicious domain, and heuristic analysis indicates it is part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'Fedex kinkos business card template' and 'wkhtmltopdf', likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=fedex+kinkos+business+card+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447464/normal_606d124d9be4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481836/normal_60b9e5a2d9af7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451561/normal_6046c0c42a966.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443819/normal_602a4374cc67c.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/e8215b80-dc69-4e99-b00b-65d0837c3d26/ilustraciones_cristianas_cortas_para_predicar.pdfIn PDF document text
    • http://lomexalipele.pbworks.com/w/file/fetch/144614784/mugitubotaladoxituvewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3302ba6-b980-411f-89ab-19c0ed2b6e2a/xejibuvasow.pdfIn PDF document text
    • http://gazumadu.pbworks.com/f/kovebetanafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ff9e932-db11-4efc-afbe-e2c9d5ec4293/rinef.pdfIn PDF document text
    • http://risoxef.pbworks.com/w/file/fetch/144574122/zopujiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34b5dc8-915b-44ad-8980-e553cee143b3/tifirunatavopufosezujoxi.pdfIn PDF document text
    • http://pojaweku.pbworks.com/w/file/fetch/144707511/ros_de_color_prpura_2_pelicula_completa_espaol_latino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48fb7491-60c4-40c3-87b0-38144b838bc8/how_to_hook_up_a_behringer_mixer_to_a_computer.pdfIn PDF document text
    • http://ronefete.pbworks.com/w/file/fetch/144492063/69222657863.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b3b56eb-1a74-4d0b-b8d0-daf76e6c3c94/45695646391.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf364407-d367-49eb-8185-518415fb4fcb/xojoratasipanufiguvoze.pdfIn PDF document text
    • http://lulatigono.pbworks.com/w/file/fetch/144541602/driver_printer_brother_dcp-t310_free.pdfIn PDF document text
    • http://kosubufegu.pbworks.com/w/file/fetch/144679314/pirateology_game_rules.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a11fb5bf-9c33-4c04-aff6-b4e6bb707c0a/roman_adventures_britons_season_1_caches_level_20.pdfIn PDF document text
    • http://tufukamapaf.pbworks.com/w/file/fetch/144685479/what_has_poor_communication_skills.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_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 5444 bytes
SHA-256: a7ba1dce59e412be5d4c6871ca375f2dd9efeaa0e6d204cf70f2ec97534a05a3
font_01_sfnt_off00011a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A20 10660 bytes
SHA-256: d215c1f90ccea1a75fe7a8b19f6815daa65d3aef2a0db6a7edbd5149648585d6