Malicious PDF — malware analysis report

Static analysis result for SHA-256 f014b4e3773f2915…

MALICIOUS

PDF

71.4 KB Created: 2021-02-25 15:45:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9b3f8d65976393469ee074723ec1653d SHA-1: 4d12d4f17c66ad2e63c4962733daef2f051716fe SHA-256: f014b4e3773f29152a9cb1e757de608745d65cc5658443dbdcaaf62cffa64773
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of a link impersonating a search result for a medical textbook further indicates a phishing or scam attempt. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jacksth.ru/aws?utm_term=harrisons+manual+of+internal+medicine+pdf PDF link annotation
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/febetewe.pdfIn PDF document text
    • https://cdn.sqhk.co/gukisafuw/bhfidj8/burger_king_near_me_now_drive_thru.pdfIn PDF document text
    • https://cdn.sqhk.co/xavaxonad/6JC3gcV/sijenepoworebovijosebedef.pdfIn PDF document text
    • https://mejotozoferu.weebly.com/uploads/1/3/4/8/134866749/wejaluxof-lowumeno.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/tqigL4T/nick_folk_contract_with_patriots.pdfIn PDF document text
    • https://mexobuvuxe.weebly.com/uploads/1/3/4/3/134369937/fumiwonitit_sazukixokib_zetitaz_sizataretunulof.pdfIn PDF document text
    • https://cdn.sqhk.co/xisiwuba/Sb97epr/woodturning_3d_wood_carving_tools.pdfIn PDF document text
    • https://cdn.sqhk.co/tunaluvum/gfH5hhr/calculator_app_icon_black_and_white.pdfIn PDF document text
    • https://koreperuk.weebly.com/uploads/1/3/2/6/132680900/1726828.pdfIn PDF document text
    • https://cdn.sqhk.co/pefibovip/ijjaggL/zejipanupotazonijoranod.pdfIn PDF document text
    • https://cdn.sqhk.co/forinabam/idNhigj/fefufafurafux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483104/normal_5fd86b44f0f75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455185/normal_603525d6ef1fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tifoxirekurox.epizy.com/eleanor_3_blue_orchid_guide.pdfIn PDF document text
    • http://zakagoxufi.epizy.com/happy_birthday_card_template_publisher.pdfIn PDF document text
    • http://sokiguxesixup.epizy.com/case_files_obgyn_4th_edition.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_off0000dcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBC 5260 bytes
SHA-256: ed5533f4616f8ee3364419262a0d88ae694904c9b6a353751ad8f68cbcd5c72c
font_01_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 9972 bytes
SHA-256: c09533138a9a2de7370f3218104a76af313955ef7581eeea79b4835c4710e9d4

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