Malicious PDF — malware analysis report

Static analysis result for SHA-256 977c245390bfe17f…

MALICIOUS

PDF

75.9 KB Created: 2021-02-11 11:42:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b32b22faef2727284275a5e013d89fe2 SHA-1: 060e33c4999be65c7d997d688fe55f678f36ab2c SHA-256: 977c245390bfe17fcce28235c1d7e69e7ebc96a80d84fe82065b83241be850a1
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, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest this document is designed to facilitate phishing or malware distribution.

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://leonvi.ru/123?utm_term=emjoi+micro+pedi+nano+refills PDF link annotation
    • http://apparentlyopt.com/self_introduction_speech_outline_templateb1614.pdfIn PDF document text
    • https://robedovetukurur.weebly.com/uploads/1/3/4/7/134754045/2fb6749.pdfIn PDF document text
    • http://azorocheat1.xyz/monzo_mobile_banking5gnv9.pdfIn PDF document text
    • http://wowitaly.pro/internet_download_manager_keygen_generatorno655.pdfIn PDF document text
    • https://gobodukigibab.weebly.com/uploads/1/3/1/8/131856162/pevuxajij-bipibuwituze-dufepivox-xopozak.pdfIn PDF document text
    • http://blablablacar.online/lilapulebewawewumt8xv8.pdfIn PDF document text
    • http://legiontry.online/reasoning_book_in_english_for_bank_examsx2bkm.pdfIn PDF document text
    • http://icub.tech/89382670320afga0.pdfIn PDF document text
    • https://bobiguwifuza.weebly.com/uploads/1/3/5/9/135966914/sizopus_kebaned_zutupikodolimed.pdfIn PDF document text
    • http://afracheat9.xyz/87640291948pfydz.pdfIn PDF document text
    • http://instapodarok365.site/zaxiviridotagii3bnd.pdfIn PDF document text
    • http://detonic-ordina.website/27604357950utr34.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzokikili/jjwwe8D/dexolisuwezi.pdfIn PDF document text
    • http://basvuruizleme.online/viwifuwofozii6bhb.pdfIn PDF document text
    • http://govnososal.xyz/dreamer_ozzy_osbourne_piano_sheet_musickc3qt.pdfIn PDF document text
    • http://vir-tus.com/91533907485j8q3u.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/TmGXfJs/world_war_1_trenches_western_front.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
    • https://s3.amazonaws.com/dezajok/analytical_chemistry_objective_type_questions_and_answers.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_off0000e136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE136 5040 bytes
SHA-256: 91027488cba4f1e84cfcf80f116510f76bb01a0c00443458cd6110fab0eb29b2
font_01_sfnt_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 9972 bytes
SHA-256: 651f51308b92e81b212f3da2f520f094cf2bed23e1efef321e14701b3a8b9c8b
font_02_sfnt_off00011442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11442 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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