Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f1fe9e1bd3fda22…

MALICIOUS

PDF

70.6 KB Created: 2021-09-25 09:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 311201df908c6d55c192e0deed20a3bc SHA-1: 5dcda39c952be3efcfe0dfebb71e87dca3b13af2 SHA-256: 0f1fe9e1bd3fda225a5f62bb049e5aa8d8942b7d235edc078ba8f9801d4447b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or distributing further malware. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=em+spectrum+order PDF link annotation
    • http://rhondachem.com/d/files/mizifuzuro.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/zotavadi.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/biguwem.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/tibesokud.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/95409246460.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/24288490405.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/vajononidunufidixob.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/gulakuxekek.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/zogojiriwanabara.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/52209441060.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/16002902108.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138e9f872edc---93113850957.pdfIn PDF document text
    • http://rvhifi.cz/files/file/1807665084.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/rixutenijemiw.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/51866938672.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/xukuvasopuvebarariwuremon.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/kowozaseredeliwikolabu.pdfIn PDF document text
    • http://kingsfci.com/userfiles/file/72021819064.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/gizan.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091700334473499.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/5152981273.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210916204720_259125980.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b0566d7ae---dukafuvativ.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/suvusetiwibonuravoxiju.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_off0000b298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB298 10352 bytes
SHA-256: 0e2ad6ec273ed8fde91ac48b4a352a343420d9591b046cba660015930d05d32a
font_01_sfnt_off0000c9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F8 16184 bytes
SHA-256: 6cad9641ce8095dce2dbb01982f3bcc5ab910310967a0d297978fce7975a7e63
font_02_sfnt_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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