Malicious PDF — malware analysis report

Static analysis result for SHA-256 efedaab69944a87e…

MALICIOUS

PDF

77.2 KB Created: 2021-03-18 00:42:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 8e54dc5c99eeeb057625d167ac03f8f6 SHA-1: 38f8fdfafd1105345484636b89a99eba12d6ef21 SHA-256: efedaab69944a87e70791b07214824ba6fae21344b6560fcc0ad288f9842ce9b
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 pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://soxebez.ru/wix?keyword=looking+inside+cells+answers PDF link annotation
    • https://cdn.sqhk.co/gaxozamikoge/hhhKghT/razidubelafexe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478438/normal_6006372fbd166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481403/normal_6019d2812fd1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486984/normal_5fcc1ddf83d7f.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/bc87043e9f.pdfIn PDF document text
    • http://gomijexa.mywebcommunity.org/99906761402.pdfIn PDF document text
    • https://xodinelexobi.weebly.com/uploads/1/3/1/4/131438891/xiduboden-futuvoxa-timimari-jilik.pdfIn PDF document text
    • http://bukenisefino.mygamesonline.org/risk_management_policy_bank.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414357/normal_600c61faa92a2.pdfIn PDF document text
    • https://gujowidupisume.weebly.com/uploads/1/3/4/1/134131448/1463221.pdfIn PDF document text
    • https://ponebivilu.weebly.com/uploads/1/3/4/5/134505494/zomovosupopape_baregemavexi_welewaruj_sotonizofiweda.pdfIn PDF document text
    • https://cdn.sqhk.co/jidevumedure/gqhijfI/ice_breaker_questions_for_work_during_covid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493282/normal_6019ca594041e.pdfIn PDF document text
    • https://nulenedo.weebly.com/uploads/1/3/6/0/136084055/5230588.pdfIn PDF document text
    • https://cdn.sqhk.co/kigoxeni/ighiicw/spectacled_bear_cub_chester_zoo.pdfIn PDF document text
    • http://jirusulixozome.scienceontheweb.net/que_significa_titulo_salvage_en_un_carro.pdfIn PDF document text
    • http://nebofonuve.mywebcommunity.org/class_10_chemistry_chapter_5_notes.pdfIn PDF document text
    • http://gusevoxuzuwelap.mywebcommunity.org/audi_a4_specs.pdfIn PDF document text
    • https://wosapinilesodiw.weebly.com/uploads/1/3/5/3/135347506/fatazeluzurekuk.pdfIn PDF document text
    • https://lizelizana.weebly.com/uploads/1/3/1/4/131409616/rutawiwaz.pdfIn PDF document text
    • https://cdn.sqhk.co/solalokazili/IK07Cjb/army_pt_scorecard.pdfIn PDF document text
    • https://kutufexefe.weebly.com/uploads/1/3/4/6/134695169/xolesukakuvesiboved.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zesafemumibow.myartsonline.com/online_electrical_engineering_bachelors_degree.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_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 5204 bytes
SHA-256: 08afb641490cc637a8048954e781fef92c44fb854423ac7af60767684b5ab6c0
font_01_sfnt_off0001027e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 10756 bytes
SHA-256: fc63be17fadb50ed9bb62fe04e742af4f76bd6286655b4b4a24dd4117e6aac46