Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cdc52a275d3c78…

MALICIOUS

PDF

81.6 KB Created: 2021-03-19 21:05:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 05f63000075bff35e0570c6981682202 SHA-1: 2a96500d87bdf9a2fe9b04319447e038ef33658e SHA-256: a4cdc52a275d3c78881106b243fa2e66c8a0db3bd22949ef33e3ec5d9ae43580
186 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection infrastructure. The document body, though heavily obfuscated, contains a title related to 'anti human trafficking' which is likely a lure to encourage users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/strik?utm_term=how+to+work+in+anti+human+trafficking PDF link annotation
    • https://cdn.sqhk.co/vebiziwob/aaljdhj/zimogi.pdfIn PDF document text
    • https://xevogivuzu.weebly.com/uploads/1/3/5/3/135350373/zukugodadijo.pdfIn PDF document text
    • https://cdn.sqhk.co/votiwixuduzo/iiahejd/color_350_passion_twist_hair.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501204/normal_6028a995361a5.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/dowuloxatogera.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/ZFjg8cx/arran-_r_platform_espadrille_sandal_steve_madden.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/jhJTdgi/72403342618.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480732/normal_5fdf9f7477e50.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/tqifoQT/onedrive_for_business_login_365.pdfIn PDF document text
    • https://cdn.sqhk.co/kexofebiziv/jgijcXb/fovisizeluzanivulixexole.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/gehjhib/billiards_game_free_download_for_windows_7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408172/normal_600fa2ebe49a6.pdfIn PDF document text
    • https://feronokemafa.weebly.com/uploads/1/3/1/1/131164109/razagazexima_tewekazuk_vewakabopabuli_gisofafuto.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/roland_barthes_quotes_love.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413986/normal_5fe9f12dc27fc.pdfIn PDF document text
    • https://cdn.sqhk.co/korulifesewa/Whjhjha/69948452059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408184/normal_6027f4622a3a6.pdfIn PDF document text
    • https://cdn.sqhk.co/kewesowovim/rid4je3/channel_2_news_reporters_buffalo_ny.pdfIn PDF document text
    • http://rowaxamapitowej.getenjoyment.net/order_of_adjectives_worksheets_for_grade_4.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
    • http://giworutiw.myartsonline.com/why_do_songs_disappear_from_spotify_playlist.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/tovusebokiwapolegilod.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/3d_photo_maker_app_for_pc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 4964 bytes
SHA-256: 1fdfbf0c725cdb2f6c99d09baf3b0c883c8b7389ccccda34e21746ca3ee1e12b
font_01_sfnt_off00010650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10650 10588 bytes
SHA-256: aeed315e275666cc6e38cd04450b8790f621f9f91c90cd6a677d4422c5874b3d
font_02_sfnt_off00012a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A51 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c