Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0afd9cd25cf6fd5…

MALICIOUS

PDF

84.7 KB Created: 2021-09-18 20:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 26d4f1dd6a2489cd39be96f6e63964d3 SHA-1: f87fa3dfa6b776454a34ab31c66f2d566a45c56b SHA-256: c0afd9cd25cf6fd5f01280cee0664d0168a1c2c85c556599a3bb0806b6f4df0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically indicating phishing and trojan activity. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting an attempt to redirect users to malicious sites. The presence of external URIs with UTM parameters further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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 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://irlanc.ru/uplcv?utm_term=how+to+reset+android+phone+with+power+button PDF link annotation
    • http://quiltingacademy.net/fckeditor/userfiles/file/zajik.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614533fa1f984---20849412956.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/fapikab.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/romakovu.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/2431928578.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/ledijevalija.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/71725032830.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/44768089610.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/2553038901.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/7611001731.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/47278875619.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/kolalike.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/10332049514.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/78359895341.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/jonegaponamobenatogajen.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fd7401894---19235091217.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613a80228d780.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210906125143.pdfIn PDF document text
    • http://binhvi.com/upload/files/4609512786.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/82441953526.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/12745347631.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/tuvol.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/misefikezusifuxo.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/newefizojabixolireduguki.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/tirorade.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_off0000e687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE687 10760 bytes
SHA-256: 679f1b8f14ee560438144cf63ec9d48dc1a605ff4672739942464a6a2fe028e3
font_01_sfnt_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 17620 bytes
SHA-256: 38848c8da1c36183cb67708f4fecae73e7d200d3c579882cc89ecd654d29d023
font_02_sfnt_off00012d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1