Malicious PDF — malware analysis report

Static analysis result for SHA-256 73cc92d12fc869cc…

MALICIOUS

PDF

70.0 KB Created: 2021-09-14 19:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: bb8924147b3341fe725783608414e175 SHA-1: cdd9e794c80a2ba3b436b5d4732102dd35d49cab SHA-256: 73cc92d12fc869cc69cb722d27910301e577493f36492c81332efdd89006351c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sababo.pdf In PDF document text
    • http://aligokdemir.com/resimler/files/14903756994.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/jumekoguxiwuv.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/26482687322.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/vufesalelil.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/1893088852.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/28790191041.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/73431920749.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/sijokozefofike.pdfIn PDF document text
    • https://ip-pharma.net/data/files/nolafaxedakoke.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/29683727147.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c4e042275---22565070446.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/17504537476.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/woxosoworafen.pdfIn PDF document text
    • http://rc-modeller.se/images/file///32652194416.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/velenaxalijejivele.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/0696aceb77dd78842f07c4575896213d/11097575614.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/nelezekaxojat.pdfIn PDF document text
    • https://camelcarpet.org/d/files/59739932713.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/79042549039.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/42442609493.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/89978069674.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/52205693700.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/42302469327.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/42316590215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mi+note+10+factory+resetPDF link annotation
    • 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_off0000b56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56A 10564 bytes
SHA-256: a633ccc7e6a4c7b7610e7fc1f1c64fba3126a1274b0be226a8d72e512ae854b5
font_01_sfnt_off0000cdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 14516 bytes
SHA-256: fddf01ec4a50d2d8f13f109aaaf1a654f553237e9cd9cb7308abc8382dedba9b