Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0bff76f7ec78858…

MALICIOUS

PDF

77.0 KB Created: 2021-03-22 06:22:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c5058c335767ead848274b2d91e602eb SHA-1: 663b2238862d0ffb55bbdc2e88f4ac4060f114f7 SHA-256: b0bff76f7ec78858f9322dc5ac5bb09c4029fd11704f26bb6a47e9df46b85bd0
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

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://botokaw.ru/award?keyword=themes+in+literature+pdf PDF link annotation
    • https://cdn.sqhk.co/dijabidasu/gbgWifB/sisters_apparel_masks.pdfIn PDF document text
    • https://cdn.sqhk.co/xadopazo/xrrjj04/3d_chess_game_offline_free.pdfIn PDF document text
    • https://cdn.sqhk.co/betarudigi/jb4iajd/iapp_cipp_e_study_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496391/normal_5fccbe20cc473.pdfIn PDF document text
    • https://rudadikisoma.weebly.com/uploads/1/3/1/6/131606677/setew-gibubokuluwu-nusilaxupuju.pdfIn PDF document text
    • https://sazadasixitabe.weebly.com/uploads/1/3/4/4/134404720/nogunisobibifa-dexija.pdfIn PDF document text
    • https://bexokafosirur.weebly.com/uploads/1/3/2/6/132695536/joxupuxanaleju.pdfIn PDF document text
    • https://vizufawamowimo.weebly.com/uploads/1/3/4/7/134700475/rusiwisoz.pdfIn PDF document text
    • http://gexomafe.mypressonline.com/webidet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_6035a4fc7e5a5.pdfIn PDF document text
    • https://cdn.sqhk.co/firumefetev/tiaaDie/mupabutalabewudefutomowo.pdfIn PDF document text
    • https://mubuxepuvu.weebly.com/uploads/1/3/1/3/131383429/nutazamid_pomuzodet_nugujululaz_bidejitorogov.pdfIn PDF document text
    • http://niluwipewuxasa.medianewsonline.com/80700991308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453734/normal_6034357369817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370294/normal_6057dfaacbe9a.pdfIn PDF document text
    • http://zuraleres.mywebcommunity.org/carving_ski_technique.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/jdhfgjH/happy_birthday_cake_wallpaper_images.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/what_is_predictive_analytics_in_big_data.pdfIn PDF document text
    • https://s3.amazonaws.com/xidulumexi/ruponiruwimupixefo.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/3368790342.pdfIn PDF document text
    • https://s3.amazonaws.com/dosipive/87879234851.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/the_secrets_we_keep_book_lara_prescott.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_off0000f12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12E 5228 bytes
SHA-256: dcc0bdecb540301e937ef1f558162bcc0017a5db81d3602ba39856d4684f9504
font_01_sfnt_off000102c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 10468 bytes
SHA-256: 99d61044cddd67d534c2a3d16d25c71ba561b308beaf005f6bbcce47f222374e