Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c06c5e1cbf9aa9…

MALICIOUS

PDF

91.6 KB Created: 2021-06-13 15:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5856cae20267d793bfa0c2325957a381 SHA-1: 3d5e33056ff0838fba6e30ff30514ae33328d531 SHA-256: 18c06c5e1cbf9aa9f64a7b20c7942802d3e27ca9aea390c03a25b7f325751e7c
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 pointing to disposable domains and Weebly-hosted PDFs, indicative of a link farm or SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://nomylo.ru/pbw?utm_term=subst+network+drive PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392444/normal_60377ce1d7a23.pdfIn PDF document text
    • https://nobaditidiz.weebly.com/uploads/1/3/4/2/134235496/d88238.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367625/normal_606bdd0610c75.pdfIn PDF document text
    • https://nododekevage.weebly.com/uploads/1/3/4/7/134733794/9620844.pdfIn PDF document text
    • https://bopenuxot.weebly.com/uploads/1/3/4/6/134667357/1159191.pdfIn PDF document text
    • https://satotujum.weebly.com/uploads/1/3/4/3/134308249/ac16cce76d5d20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483362/normal_605ae08aa6f9d.pdfIn PDF document text
    • https://jozegolufipiz.weebly.com/uploads/1/3/0/7/130776065/55e9ef3051.pdfIn PDF document text
    • https://duwutevo.weebly.com/uploads/1/3/4/5/134597351/jivub_timolafuna_tuzifolitir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411918/normal_5fc6126db67ea.pdfIn PDF document text
    • https://beponuju.weebly.com/uploads/1/3/4/6/134626977/mokiwebepi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tagexoba.pbworks.com/f/how_long_should_a_dyson_v10_battery_last.pdfIn PDF document text
    • http://wexagiz.pbworks.com/w/file/fetch/145063668/darogulavenedozudazivewij.pdfIn PDF document text
    • http://puzavofan.pbworks.com/w/file/fetch/144556173/brain_teaser_picture_puzzles_with_answers.pdfIn PDF document text
    • http://tufukamapaf.pbworks.com/w/file/fetch/144685539/examples_of_inductive_and_deductive_reasoning.pdfIn PDF document text
    • http://gazumadu.pbworks.com/f/mindfulness_based_stress_reduction_training_certification.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/f/underworld_blood_wars_movie_download_in_tamilyogi.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_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 24768 bytes
SHA-256: 69a3d772fc1ff62037377686a1603b197668add8c4f413111a3c247f2c43b918
font_01_sfnt_off000127bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BC 5036 bytes
SHA-256: 923ebd791f9a6eeafc11cc53374e99713e0491a98f947830b542e9d2a2143f16
font_02_sfnt_off00013903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13903 11120 bytes
SHA-256: 83f90a54ad46ea9a79e1b0b2c57d8967a92b824fa019f177337a54f93b1c0718

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