Malicious PDF — malware analysis report

Static analysis result for SHA-256 16177852bcba732b…

MALICIOUS

PDF

77.1 KB Created: 2021-09-26 21:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4b96203f073e2d28120fbb4d2987e879 SHA-1: 6bbda872f6210573a462981fe6eda2980e6db4b3 SHA-256: 16177852bcba732bdc9f19d7c5ae183ac56794dc9b3e6da372ccf4be4b41f10a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://rowadhr.com/app/webroot/upload/files/duxotavujojevunixelex.pdf In PDF document text
    • http://labradory.pl/file/gamigazuvun.pdfIn PDF document text
    • http://grafitym.kz/files/file/21685365261.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/64938051806.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/59897755858.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/lasezumisotebizotipixov.pdfIn PDF document text
    • http://capital96.com/userfiles/file/44634507119.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/92729612943.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/bukotunawuw.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/kerakonolat.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/13086082021.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/10430435685.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/jozemugub.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/48762059281.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/90592248930.pdfIn PDF document text
    • https://transturist.transturist.com/ckeditor/ckfinder/files/files/fipekereguveretel.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/68664645073.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/b75c601f6022142576b2307eae117517/59543428040.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/bezudor.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/h3f07n5ctd2arglhm7ac5bn8u0/22552625573.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/pimiriwapudutapakosuzejev.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/dorasabajigibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=win+free+diamonds+ucPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/zazoledid.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B1 16656 bytes
SHA-256: fb74e4a961e1efb60f0deec18d693248f00b9f46e935210cbad3995784616410
font_02_sfnt_off0000e0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F1 16928 bytes
SHA-256: 8c697fe07a5182a24f20dfed199190d7641800acc9c75e2c8545ba473a8cd3e6
font_03_sfnt_off00010ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 10584 bytes
SHA-256: 4192ff58cfb53a2a5dd63bb9c53bc43c576c7cdf8c9831035c582e20b19e8110