Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff7b446357876ce…

MALICIOUS

PDF

84.2 KB Created: 2021-03-25 09:59:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5ae7e89c53be7151c82185fff99f0831 SHA-1: 2a23142dc159cb07f721e896db467f0cf87390f1 SHA-256: 5ff7b446357876ced328bb5c2ecdac5ddb492cfca909efff442bb9bdb08af2c9
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by a machine learning classifier. It contains a large number of external links, indicating a link farm strategy. One of the primary links, 'https://pelibifir.ru/strik?utm_term=what+type+of+charging+cable+for+samsung+galaxy+s9', suggests a lure related to search queries, likely to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=what+type+of+charging+cable+for+samsung+galaxy+s9
    • https://cdn.sqhk.co/wemitupu/jzcNidK/khali_bali_song_video.pdf
    • http://sutovuresas.mygamesonline.org/69757540067.pdf
    • http://waragofekoxexaz.sportsontheweb.net/36867655144.pdf
    • https://wakapulexo.weebly.com/uploads/1/3/3/9/133997174/fixudiru.pdf
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/mibubojugazumevi.pdf
    • https://cdn.sqhk.co/wubunepan/jd0RGha/vilapotulowitarogijupad.pdf
    • https://cdn.sqhk.co/xivomojuf/ihfe7Ek/3208483090.pdf
    • http://tibudirowe.mygamesonline.org/xazun.pdf
    • https://cdn.sqhk.co/madufuxenuw/Gspiit6/60775396285.pdf
    • https://cdn.sqhk.co/jisokemefaz/Phb3hgQ/vidajopulorezafeganexur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dufojamimusim.atwebpages.com/pride_and_prejudice_movie_free_download_mp4.pdf
    • http://pupowelepidojek.onlinewebshop.net/luxufowefevomulujomerevik.pdf
    • http://tosefiwaniw.rf.gd/zuvanufuxitarunideg.pdf
    • http://rivenoke.onlinewebshop.net/nuralinetalusejo.pdf
    • http://zimopup.myartsonline.com/project_manager_roles_and_responsibilities.pdf
    • http://fiforeru.atwebpages.com/what_is_the_best_waterpik_for_your_teeth.pdf
    • http://vedixemalirugi.atwebpages.com/kelekiwajexalowiv.pdf
    • http://vevaxadebelag.epizy.com/65221658254.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_off00010984.bin
adfbe7fc4ca6716d04049fe0b8dd57c6af1c9fe8f81fb64f4eb3f061961b72ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x10984 5908 bytes
font_01_sfnt_off00011d95.bin
22ac7e57d12894eb13eb2307ca26025a68f0270c6265e9049d700ac8a2d0ec8b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D95 11012 bytes