Malicious PDF — malware analysis report

Static analysis result for SHA-256 907e16d68d2f3730…

MALICIOUS

PDF

79.3 KB Created: 2021-10-05 04:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a5e0528cc118921c69129412ddeb00b1 SHA-1: 0da19a3660b959ddd3612ea832113baede986980 SHA-256: 907e16d68d2f3730cbfee586c8303b3c0df711838754d9d7539484ac5cab3b77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm or content distribution network. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, reinforcing the malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://idominjazz.com/fckeditor/userfiles/image/datafikovaviboz.pdf In PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f98f5c1e5c---56206422880.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/95916845257.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/rebesosulunarutitu.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/pepatunedefapudami.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/20096897775.pdfIn PDF document text
    • https://strechybenesov.cz/content/pilidutobowiximevi.pdfIn PDF document text
    • http://come2menorca.com/images/file/gapasevizok.pdfIn PDF document text
    • http://dfanchem.com/upload/files/65860381574.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/68123659952.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/zetuvefiguzomokaku.pdfIn PDF document text
    • https://polytex.de/sites/default/files/31601822232.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/xalufukosogej.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/86689138380.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/71528505559.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/vewuzixifexusol.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/43283998907.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/5981521679.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16156aacd9c811---telulodarerademiw.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/zirowatobud.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/kixesokopi.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/49079686043.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/fumilagatavofazilopesenu.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/71482639256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=margot+robbie+in+pirates+of+the+caribbeanPDF 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_off0000d0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AD 10844 bytes
SHA-256: 565ff00205015ff357ac8093e9d6bcaa3a7e56b706c6d30f42d36505adbea7ab
font_01_sfnt_off0000e979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE979 18164 bytes
SHA-256: e0bd4a9a10ccf46ef81077b3924dd37e238cabbbb00826534fe5e2b3bac5732d
font_02_sfnt_off00011733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1