Malicious PDF — malware analysis report

Static analysis result for SHA-256 684cb4752a94368b…

MALICIOUS

PDF

60.8 KB Created: 2021-02-15 10:01:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cfdda3fb27a255926d3a7c3da9988411 SHA-1: a64fa97a3f7fd1da4ff504a2eb910a7f5faca1d6 SHA-256: 684cb4752a94368bb6f643605bd312e30c2d55a3efce9e89afd88b05b0b35930
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing lure. The document contains numerous embedded URLs, including one that redirects to a suspicious domain (`jottigo.ru`) when a user searches for a common query. The PDF's structure and the presence of external links suggest it is designed to direct users to malicious websites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=why+does+my+toilet+run+every+few+seconds PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369927/normal_5fe2b8dfea2a8.pdfIn PDF document text
    • https://cdn.sqhk.co/sozimelizak/ib0gfOs/green_pepper_have_carbs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418368/normal_600124c826e56.pdfIn PDF document text
    • http://levelupguild.com/dimeterubaxiava3.pdfIn PDF document text
    • http://spoonnumberone.xyz/convert_your_vce_file_to_onlinejhl7v.pdfIn PDF document text
    • http://instas.site/slither._io_mods_ios_downloadykd37.pdfIn PDF document text
    • https://cdn.sqhk.co/zixapegof/ghc9345/funny_animation_movies_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417807/normal_602286959884d.pdfIn PDF document text
    • http://kavelux.22web.org/37461285231.pdfIn PDF document text
    • http://findssldz.xyz/16608468084d9wnc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_601145b55e1b7.pdfIn PDF document text
    • https://cdn.sqhk.co/badalozebale/hfUHLTX/68474553425.pdfIn PDF document text
    • http://usacreditmonitoring.info/the_ampscript_guide_eliot_harper12e7o.pdfIn PDF document text
    • http://arfeshome.com/chikni_chameli_video_song_3gpplxvq.pdfIn PDF document text
    • http://eeuuurrrrr.space/78675932354rcln7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000b2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AC 5316 bytes
SHA-256: 1b13dc315652d9ee11f0453a56d7f4b8c48cbc7f73139b922d6171f3bb6e419c
font_01_sfnt_off0000c4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BF 10064 bytes
SHA-256: 618dd759f852ec1d4ed17aef9d734f69d49071547d7ee5f17a1ad3d829d3281e

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