Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23424af9fd20756…

MALICIOUS

PDF

82.5 KB Created: 2021-06-07 15:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5c3b9b36e0937c5f9b2bf20e50cbdbe4 SHA-1: 5376657d1cdd28a72972c936404af50be815bead SHA-256: f23424af9fd2075652fa05f92da51f8a0159b62127786c4865a54dcd60218318
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting services, indicating a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, suggests a lure related to common search queries, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://chcial.ru/pbw?utm_term=what+can+i+mix+with+avocado+smoothie PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482230/normal_5fff73bd1774e.pdfIn PDF document text
    • https://kabuvegezukab.weebly.com/uploads/1/3/5/3/135325093/pinuwukaxumet.pdfIn PDF document text
    • https://wofibenozoga.weebly.com/uploads/1/3/5/3/135321696/2c4f76fffa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402504/normal_5fd5f3061ec22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427785/normal_5fcb02287e150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415080/normal_603f6aefe6c85.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477649/normal_5feb486eaddff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taxexuwej.pbworks.com/w/file/fetch/144781896/11293493604.pdfIn PDF document text
    • http://zufumegi.pbworks.com/f/lunafi.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/f/friction_on_horizontal_and_inclined_plane_lab_report.pdfIn PDF document text
    • http://xifilipisi.pbworks.com/f/what_are_alchemical_symbols_used_for.pdfIn PDF document text
    • http://pudamalulera.pbworks.com/w/file/fetch/144599229/merry_christmas_drake_and_josh_full_movie.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/93178675896.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/672e4ab4-512a-405f-88cf-44d26ffded1a/interior_graphic_design_standards_free_download.pdfIn PDF document text
    • http://fevosezew.pbworks.com/w/file/fetch/144599646/365_days_of_dash_diet_recipes.pdfIn PDF document text
    • http://wenuveraroto.pbworks.com/f/19055042502.pdfIn PDF document text
    • http://barotidi.pbworks.com/w/file/fetch/144730182/ccna_200-301_official_cert_guide_volume_1_premium_edition_ebook_and_practice_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d65b5296-df38-4d99-895b-74b7a8884065/68015966057.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144426837/12222580142.pdfIn PDF document text
    • http://wojoxevom.pbworks.com/f/fonts_keyboard_-_cool_fonts_pro_apk.pdfIn PDF document text
    • http://vazesuna.pbworks.com/f/bazaart_free_alternative_android.pdfIn PDF document text
    • http://lopofemusun.pbworks.com/w/file/fetch/144618729/moriwejodilosoduzejar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d840639-1e16-48ad-9129-654d97fc2631/what_is_the_cheapest_place_to_ship_a_package.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4af1684-e675-4c4b-9859-5124f7df9d28/how_to_tell_rim_width.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_off0001064f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064F 5284 bytes
SHA-256: f19627fa1902a7a4d1ba0d18d716fc118cee91cd2a4470b6c0a20a845b688636
font_01_sfnt_off0001183f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183F 10732 bytes
SHA-256: 038070b6d6128e1653e4163a6629e5901a2966b43819ff98e63c94e116fb2c06