Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfddb2936132bb9c…

MALICIOUS

PDF

165.4 KB Created: 2021-02-25 16:09:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9570cbbe02f2edbd8857ef439ee9dda3 SHA-1: e16054387274168017b2a68b31a1bdc03529b39f SHA-256: bfddb2936132bb9cb3cdc61b37890b928b6d3d4954b83cb798dc019cb0d1e7c1
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 embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a pretext for these links, likely aiming to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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=top+10+volcano+movies PDF link annotation
    • https://wojadamizaxit.weebly.com/uploads/1/3/2/6/132681796/jinonew.pdfIn PDF document text
    • https://cdn.sqhk.co/baresupujar/fgehhhi/go_fish_online_aquarium.pdfIn PDF document text
    • https://cdn.sqhk.co/gufuluzibos/jayLqvE/78575214704.pdfIn PDF document text
    • http://muvezada.iblogger.org/karosare.pdfIn PDF document text
    • https://federadedeladol.weebly.com/uploads/1/3/4/6/134626130/wumepiminutojazewe.pdfIn PDF document text
    • https://regutipedazuvi.weebly.com/uploads/1/3/1/0/131071249/6033822.pdfIn PDF document text
    • https://cdn.sqhk.co/dukoredod/hczigij/asteroid_impact_on_earth_in_future.pdfIn PDF document text
    • http://mirror-x.org/10541360237ocm5p.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/63170970171.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/H6jgoxt/vujulikibozonasizavukazi.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/digLogj/cricket_live_australia_app_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375086/normal_5fcbdc987adaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fikexole.rf.gd/bombay_dyeing_bed_sheet_online.pdfIn PDF document text
    • http://lixanixuzuki.rf.gd/73392626172.pdfIn PDF document text
    • http://sasukagisodubex.onlinewebshop.net/how_to_reset_a_droid_turbo_2.pdfIn PDF document text
    • http://supuwevul.atwebpages.com/how_to_build_muscle_while_burning_fat.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_off00024991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24991 5184 bytes
SHA-256: 33cedd8f38b561b2757c83fd9faada8b7ae490b87caf6838d488de33c03244f9
font_01_sfnt_off00025b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25B36 14588 bytes
SHA-256: 508f7c2d76eed323a5c91775084f0b057f5b848595fe37e6649f74ceeab5f68b

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