Malicious PDF — malware analysis report

Static analysis result for SHA-256 102b1e55bd98adce…

MALICIOUS

PDF

87.7 KB Created: 2021-03-24 20:09:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea6d0ef736dfe53fb899295707591803 SHA-1: 2af3d98cddb133534cef5b51f918c99fca807284 SHA-256: 102b1e55bd98adcef957717cc96d243a1fc6184d7c0dee525de28e95b1b1404c
126 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to suspicious or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure, likely leveraging spearphishing attachment as the initial access vector.

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://jacksth.ru/strik?utm_term=the+power+of+radical+forgiveness+pdf
    • http://gebuhrenfrei-mein.com/tulowal0i1ck.pdf
    • http://repair-kvadrokopterov.ru/navotamozirefitvoc41.pdf
    • http://idealicacolumbia.site/27769995664a1xw5.pdf
    • https://static.s123-cdn-static.com/uploads/4459058/normal_5fcd9d23054a7.pdf
    • https://cdn-cms.f-static.net/uploads/4451047/normal_60215d45eec35.pdf
    • https://cdn-cms.f-static.net/uploads/4486534/normal_604cd9ca11dd6.pdf
    • http://siparuzavikowut.iblogger.org/what_is_the_role_of_o2_in_photosynthesis_mastering_biology.pdf
    • https://cdn-cms.f-static.net/uploads/4483870/normal_601e2bad2ff8a.pdf
    • https://cdn-cms.f-static.net/uploads/4402707/normal_6028f04e812fc.pdf
    • http://katermore.ru/elton_john_songs_from_the_west_coast_wikipedia3w6h8.pdf
    • http://duplicwcnj.space/88165556100pyd99.pdf
    • http://cuzinfo.ru/acoustic_audio_aa5170_review5hlcj.pdf
    • http://kobasobapina.22web.org/macromedia_dreamweaver_latest_version.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_a15d27db4cda4bff9c531a2a65f5e28f.pdf?index=true
    • https://s3.amazonaws.com/niwotipugonuvoz/29040716017.pdf
    • http://tozurome.epizy.com/kukaruxipinowi.pdf
    • https://s3.amazonaws.com/lupebesu/felofuvukukodadiru.pdf
    • http://dasiletu.epizy.com/jijoporixigujexilutopisez.pdf
    • http://gakubik.epizy.com/koruvilugebokomeroguf.pdf
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_b0a995ef3e6e43829a9248833fbf646f.pdf?index=true
    • https://s3.amazonaws.com/sezebepit/platform_ankle_boots_womens.pdf
    • https://s3.amazonaws.com/gupawupigawono/rakewaduwitogezu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119c8.bin
5a392bf52b88fef926dbce460b0e0da99571c9cdd3a6223e684a7bfb657e8f79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119C8 5520 bytes
font_01_sfnt_off00012c9f.bin
3acdb81537f33924004fbd749830b024f264a24a42f44718f0ee78b3362f3327		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9F 10916 bytes

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