Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e9369225f90cc6…

MALICIOUS

PDF

93.2 KB Created: 2021-03-14 15:02:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ab8fb4a7d84ced388f7568a8573c7d92 SHA-1: b0e4634aad77cec3505252f768264de4568d239b SHA-256: 86e9369225f90cc67b76291eb52f11ec4e9fc1c26bdff65cb61bf6f4f5830fcd
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 hosted on disposable domains, characteristic of a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

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://nipisod.ru/strik?utm_term=computer+hardware+tools+examples PDF link annotation
    • https://cdn.sqhk.co/vozevadijut/fYRPFij/sad_alone_girl_pic_with_shayari.pdfIn PDF document text
    • https://cdn.sqhk.co/tevimuwijile/gOfDod3/89209835784.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/jeMiajZ/vesubupew.pdfIn PDF document text
    • http://baby-slings.ru/201476401327bjfu.pdfIn PDF document text
    • http://shoes-storie.club/ar_15_parts6i43h.pdfIn PDF document text
    • http://sport-stavki.fun/89318929880eqef1.pdfIn PDF document text
    • https://cdn.sqhk.co/waxuniwite/rjfjcgd/fastsave_for_instagram_app.pdfIn PDF document text
    • http://reduslim-sito.site/what_words_should_not_be_capitalized_in_titles1e19p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/72a25ffa-b90c-452b-942d-8dc8788b2eb8/coleman_powermate_vantage_5000_parts.pdfIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_6b2b8f1802c24c8eaacc4af29989d941.pdf?index=trueIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_d29b14a5a33c439cb5459b3a7820f48c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/37b42189-1636-45fa-9cb0-57bccbb70182/all_my_friends_are_dead_book_reading.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a6be3ea-e15d-486b-b26d-f72182102234/84842559007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e19a2646-5539-44cb-ae52-db9c2bbb506d/how_do_i_set_my_citizen_eco_drive_nighthawk.pdfIn PDF document text
    • https://0df22b04-17ae-4e65-9af8-3af4445b4601.filesusr.com/ugd/71fd01_cfe8f5d91f464b72a60f4642ec714905.pdf?index=trueIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_58821c75c1024b5397f0ec60d33c1742.pdf?index=trueIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_ec3da8558b394e169527bcdb2bad5e1e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb80dbfc-5848-460e-8871-48692648fa59/dictionary_english_to_hindi_download_for_pc_windows_8.pdfIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_7c4ba562cf0942e39124c7cd87d7d0a7.pdf?index=trueIn 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_off000122f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F3 5108 bytes
SHA-256: 1a49a9f8bddf648ce9daecc01176527667aa22bea8032dc540960f330ebcf84f
font_01_sfnt_off0001346e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346E 10744 bytes
SHA-256: 2932938c7ce652974d80c83e35707d9ef63c309b328621dec67e9e5e102f520a
font_02_sfnt_off0001591a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1591A 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230