Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ba7e180f2a51e0…

MALICIOUS

PDF

70.6 KB Created: 2021-10-02 12:03:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6cd5bc245e17248eab3de71596c3c454 SHA-1: 9f348008e178f46f259a0ae703e5d2269ad947a3 SHA-256: a0ba7e180f2a51e0207729af8a18a1f3e1cf737a69bfa0cd0689a0266205b919
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs, many pointing to disposable domains and IP addresses, indicative of a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=gk+objective+questions+and+answers PDF link annotation
    • http://sm.ac.th/ckfinder/userfiles/files/punibubawusuf.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/69389777011.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161308d48e63e1---86816078620.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/fixoruguxazikuzefisejusa.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/22087686820.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210930191233.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/43806474414.pdfIn PDF document text
    • http://usateatop.com/_upload/files/fuberanupuwixilus.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/71453341923.pdfPDF link annotation
    • https://journeywithmypet.com/ckfinder/userfiles/files/7514452428.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/bonexikulukatazurunixom.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/deligaruzodibodamikibilur.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/35360709084.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/wubozejubesabifokuk.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/32619509012.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/jozanolesagudatosupu.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/dojolesibanejodes.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419c1cd4669---55046381670.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/91085481675.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/90399042916.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/gomevulavawepopetod.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/febomurabanakujavodo.pdfIn PDF document text
    • http://voijin.com/userfiles/files/veloka.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E5 11116 bytes
SHA-256: 0c3bf654a36cca1a1b1fa6123e6cd59a07b0139eebe83086cee86e707d2573a2
font_02_sfnt_off0000e1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D4 16672 bytes
SHA-256: 46506aedaf39e48f97d6988277c2fb0b44b509ddf78900ef9da468e2966a820d