Malicious PDF — malware analysis report

Static analysis result for SHA-256 177cb30caf975e9d…

MALICIOUS

PDF

74.3 KB Created: 2021-10-11 01:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 93dda0dff83b5032639f43b1b66e1838 SHA-1: eb26fe678d92aff7b1364a4cabea53de8581610e SHA-256: 177cb30caf975e9d7acf46357e4aa7127ca4c4bd6b10d9ec925842e141398d91
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs and the PDF's structure suggest it is intended to redirect users to potentially malicious or phishing websites. No scripts were extracted, but the presence of numerous external URIs points towards a phishing or credential harvesting attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=16ga+stainless+steel+thickness PDF link annotation
    • http://rulada.by/upload/editor/files/10947077205.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/sogarin.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/lotiberilufi.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/rufebanozuzujimovowev.pdfIn PDF document text
    • http://minerva-collection.net/files/files/93225672244.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/20017274235.pdfIn PDF document text
    • https://naves.cz/res/file/bulal.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/49710560621.pdfIn PDF document text
    • http://specialcats.nl/media/files/lutuwuwuxovaduwij.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/53548998912.pdfIn PDF document text
    • https://koratspring.com/upload/file/rifunarefuvesitezifiva.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/6377304742.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/9386990193.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/58362749016.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/xijafoso.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/38844501636.pdfIn PDF document text
    • https://norservis.cz/files/files/75712740371.pdfIn PDF document text
    • http://www.buildonhope.org/file/gikazevakedomebixutef.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/82427339136.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/59897222000.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/zogefixemaxivutalelineke.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_off0000bf8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A0 17168 bytes
SHA-256: 87a10f7ab7e3bb483fd85bcbf68c999489c8f479d570a345d8997ef4c562da6b
font_02_sfnt_off000103e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E6 10504 bytes
SHA-256: 4e0897782892a2dd86d20ca69bb86a55f24206a0426d8ce0b68b46820b9eda32