Malicious PDF — malware analysis report

Static analysis result for SHA-256 595842bd68fc1bdf…

MALICIOUS

PDF

89.5 KB Created: 2020-11-23 08:29:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea089aa20c003a18ca4036d6be6bff2e SHA-1: 152a5ac440d4f8e506d7aefc6220eea05713c2a0 SHA-256: 595842bd68fc1bdffa7b9c4662ab27b3c65eef0eb016ece88a0cd09e137db262
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, a technique commonly used in link farms to manipulate search engine results or to redirect users to malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and a link farm strongly suggests an intent to redirect users, likely as part of a phishing campaign or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/123?utm_term=brazing+vs+soldering+aluminum
    • https://buxivadoga.weebly.com/uploads/1/3/0/7/130740323/2dfe2054c.pdf
    • https://xebivonejawaf.weebly.com/uploads/1/3/4/0/134096192/8973087.pdf
    • https://vakigosem.weebly.com/uploads/1/3/4/4/134480352/e255687e2557.pdf
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/2139505.pdf
    • https://komavumi.weebly.com/uploads/1/3/0/7/130738531/160679.pdf
    • https://zufugorutamivas.weebly.com/uploads/1/3/4/4/134401118/e7b662cdd9e.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/859f69ef-3e6e-4e94-a630-a8de092da273/65255776704.pdf
    • https://uploads.strikinglycdn.com/files/b5fc0f69-2837-41a9-9d38-58c54fed4dab/amulet_books.pdf
    • https://uploads.strikinglycdn.com/files/2081a452-18ab-405f-a9df-53f290c976e0/iqr_worksheet_6th_grade.pdf
    • https://uploads.strikinglycdn.com/files/f2087477-b726-4cdb-8391-663fbca9bdb2/fubitixuduzasekosuzefides.pdf
    • https://uploads.strikinglycdn.com/files/6eda3ba6-98fd-4999-b050-a5daaaf81cd6/graphic_organizer_online_games.pdf
    • https://s3.amazonaws.com/kudefem/24149409957.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010296.bin
18ef1d9f5c6eebc92a999892948649773ef18056e01a5a4f53300d382e2136f7
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10296 16756 bytes
font_00_sfnt_off0000f09d.bin
5fb106e0f4addb0dcf982c2b632d1c24959149131b8ccdc939b74c34ff64391f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 5304 bytes
font_02_sfnt_off00013115.bin
d42751508ea43114b6cf289d5114d72082dfe5d45b7795009be7030bdb2f4dc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13115 12060 bytes