Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad6f74b973cffd4…

MALICIOUS

PDF

73.7 KB Created: 2021-02-28 05:12:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c50c02b83331c55063eb7867c696a2c SHA-1: 67b3b34effb5ad73f923297234fa9f61d7f7aa6e SHA-256: 0ad6f74b973cffd414b9c176a4721f1af0d7d7295e7049b2776cedf8b79928e7
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting a malicious intent to redirect users to potentially harmful content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of numerous URLs indicates a likely attempt to download or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/aws?utm_term=quickest+way+to+learn+organic+chemistry
    • http://domilajen.22web.org/tinef.pdf
    • https://milorali.weebly.com/uploads/1/3/5/9/135965765/9383357.pdf
    • http://kidalozexeneni.iblogger.org/zalanazetitokebukas.pdf
    • https://cdn.sqhk.co/wudenedu/jigjTVG/12824620123.pdf
    • http://yesnutural.space/bruce_almighty_full_movie_hd_freeydvrk.pdf
    • https://cdn.sqhk.co/mezugifosa/l1igOJy/followers_skyrim_blades.pdf
    • http://sarkife.site/1355990061251s3e.pdf
    • https://static.s123-cdn-static.com/uploads/4456686/normal_5ff35ed064fc7.pdf
    • https://memibufosigi.weebly.com/uploads/1/3/1/3/131383384/6085546.pdf
    • http://nakrutkavk.site/sozapogeluniju6tcbo.pdf
    • https://cdn.sqhk.co/bowazeduz/3yijijr/fubexuvinun.pdf
    • http://flowerport.shop/62443629268zzm2r.pdf
    • https://cdn.sqhk.co/mopewedote/vUrdKgd/windows_server_2016_remote_desktop_connection_limit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zudosikewemer.epizy.com/building_background_photo.pdf
    • http://bususetut.epizy.com/brute_force_attack_free.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_off0000e42e.bin
529ea0fbabf2a26909a5256f6743c7d04ef7e9220b8c1abb48c9446318a9904b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE42E 5532 bytes
font_01_sfnt_off0000f6fc.bin
7b6f327ef3be3b6852a52e1065e6b1c1ba43c9b9c01bc1ad7a72bef6967d7783
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FC 10240 bytes