Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c73bda9b42882f…

MALICIOUS

PDF

71.8 KB Created: 2021-02-17 03:47:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 3a248d12df5ef65d91c7f36ab8ee37f7 SHA-1: d2632c0b638c93a04283ad4c143af9dffaae79ad SHA-256: a8c73bda9b42882f866add05cddf743d9f56d353e35fc8fde07ace61a0830e74
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, suggesting a link farm or SEO spam operation. 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 numerous URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=what+is+the+best+way+to+treat+a+cystic+pimple PDF link annotation
    • https://xijafidul.weebly.com/uploads/1/3/2/3/132303061/f182989326.pdfIn PDF document text
    • https://cdn.sqhk.co/tenokesime/7iftHTm/red_roses_lil_skies_lyrics_traduction.pdfIn PDF document text
    • https://belanuxaru.weebly.com/uploads/1/3/4/6/134670531/630358.pdfIn PDF document text
    • https://cdn.sqhk.co/nusideja/dhimTex/rewasofaritavifuwisok.pdfIn PDF document text
    • https://lupawepenotude.weebly.com/uploads/1/3/1/6/131606523/wosuwuw_ruvego_tujomu_gubosuxabixuti.pdfIn PDF document text
    • http://dokarukaxita.22web.org/open_office_business_plan_template.pdfIn PDF document text
    • https://wugoxuvalego.weebly.com/uploads/1/3/4/0/134017666/06c22d7cc.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/4Wii9ha/luribunefokiwel.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/hggihgf/bang_bang_bang_song.pdfIn PDF document text
    • http://tesidakikize.iblogger.org/manual_auto_off_light_switch.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/icujahb/xevinemamawiru.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/gjaEC2h/guess_the_movie_theme_tune_quiz.pdfIn PDF document text
    • https://cdn.sqhk.co/lufelumad/iaidijE/adaptive_card_fallback.pdfIn PDF document text
    • http://ledojekukifal.iblogger.org/lilowaza.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/uhiJ2gg/highway_to_heaven_season_5_episode_2_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/wekababu/ezYjYea/jefur.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/EihgdPQ/nijibobuguzu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vopepogam.rf.gd/falchion_knife_fade_guide.pdfIn PDF document text
    • http://jovifididapop.epizy.com/dilil.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_off0000dc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC52 5520 bytes
SHA-256: 8a42da78f11a22ecfb576313419d677b3115b03fda7f29cf34f919ca96ec32e4
font_01_sfnt_off0000ef06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF06 10120 bytes
SHA-256: f980bfbc5de811358b65236a9dceeb7054d2043dcd1b578b87b881a777f29ffc

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