Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc7eacfe2d4f7e4…

MALICIOUS

PDF

75.4 KB Created: 2021-03-03 19:48:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9a3d26673f2df791bb397db567f924b6 SHA-1: c4faa22ebdb32c1e9623156239741fcf3e2f2792 SHA-256: 3dc7eacfe2d4f7e40371537b5401c81419a65771c9b4d43d15e993d15c3c2d93
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' parameters in some URLs further supports the idea of tracking user interactions with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://ponafet.ru/strik?utm_term=what+is+r+ideal+gas+constant PDF link annotation
    • https://cdn.sqhk.co/vozaxodep/jimu8ia/business_studies_igcse_textbook_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_6013e92650a64.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/jjAPjgJ/dojidelinupupepiwajafagu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378836/normal_601b0388a3025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420915/normal_600d88abc6528.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506159/normal_5fdc0ab61a85a.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/gjjfjgH/piano_tiles_2_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501042/normal_6008839084352.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/ifzhdge/top_40_radio_songs_2020.pdfIn PDF document text
    • http://ipatovaalena.ru/ainu_last_namesub6sd.pdfIn PDF document text
    • http://romeita.space/edit_text_in_on_ipadkpx3v.pdfIn PDF document text
    • https://cdn.sqhk.co/sadopore/54vijfj/red_ball_fast_bounce_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pefutofoxuraz.rf.gd/arduino_uno_wifi_shield_not_present.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/hyundai_elantra_2012_manual_transmission.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/jonagatobegufu.pdfIn PDF document text
    • http://xinozotaga.rf.gd/63058507875.pdfIn PDF document text
    • http://nopizimexid.rf.gd/one_punch_man_characters_garou.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/2160459146.pdfIn PDF document text
    • http://tinejamuwaki.epizy.com/27572697238.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_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 5216 bytes
SHA-256: 50db0b71d449a6613605af1c9975a7475173c3f212fab5b0f0fb850ea5a5b53e
font_01_sfnt_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 11356 bytes
SHA-256: 9ee7457a825494f6c7ac579a351eacfa48a3837e585b2a33deb112b41bcbc3e1

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