Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd432cf5f2501d0…

MALICIOUS

PDF

74.2 KB Created: 2021-03-16 01:11:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed087f63bbf3276d02743410dc191f4c SHA-1: dbe2e5ba2ab855f393273e9609bda315814a0b3f SHA-256: 3dd432cf5f2501d0fbdb56278fc8eba7d3c8e62a821a6af5f7515796a957eaf3
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, and one prominent URL is `https://druttle.ru/wix?keyword=anyone+else+2020+car+magnet`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates the PDF is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the embedded URLs and the link farm heuristic strongly suggest an intent to redirect users to malicious sites.

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://druttle.ru/wix?keyword=anyone+else+2020+car+magnet
    • http://jovepodixowofow.mygamesonline.org/jodiduvurevikawu.pdf
    • https://cdn-cms.f-static.net/uploads/4382003/normal_5fdb00acb0345.pdf
    • https://cdn-cms.f-static.net/uploads/4443821/normal_6045bbbf4b1eb.pdf
    • https://cdn.sqhk.co/wozejodes/hcifZlL/lumivetaz.pdf
    • https://zanefasijim.weebly.com/uploads/1/3/5/9/135965469/5974095.pdf
    • http://jojidasusesot.sportsontheweb.net/tuck_everlasting_book_vs_movie_essay.pdf
    • https://nizifaweneli.weebly.com/uploads/1/3/4/5/134589853/savavuxe_pudip_laxafe.pdf
    • http://sekewutu.iblogger.org/are_sh_green_stamp_books_worth_anything.pdf
    • http://womirewuzakuf.sportsontheweb.net/38150157963.pdf
    • https://cdn.sqhk.co/butaliwe/hfieugg/acellus_homeschool_parent_login.pdf
    • https://cdn.sqhk.co/nurafurofopu/qif3Whp/87564923528.pdf
    • https://cdn.sqhk.co/goluxewimabu/bS8igY7/tik_tok_video_download_2019.pdf
    • http://mubokugezop.22web.org/what_to_say_when_he_comes_back_after_disappearing.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c81e848d-bd0a-4761-87f7-5d7395f3ff0d/65450179209.pdf
    • http://bokapiwupepox.rf.gd/5671078419.pdf
    • https://uploads.strikinglycdn.com/files/474a70ed-6e28-40d5-8642-c309c4af9188/63863953448.pdf
    • http://zimemotom.rf.gd/fleur_de_lis_template_invitation.pdf
    • http://rujidafedisezu.atwebpages.com/my_cloud_ex2_ultra_set_up.pdf
    • http://zizaxutezojewif.rf.gd/40552955187.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_off0000e10f.bin
429872bc7cb0e40b48a36d5d47b5faf704870b27906124b75aca1b4e6b21fddd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE10F 5484 bytes
font_01_sfnt_off0000f3ae.bin
d3a872f32d341e7d611ba78b0656f7d0b2451d0369a78b5b2f0cf8160c4eb1c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AE 11284 bytes

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