Malicious PDF — malware analysis report

Static analysis result for SHA-256 40768ebef1039107…

MALICIOUS

PDF

68.9 KB Created: 2021-02-17 20:10:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 24fd8b7e6f9d9ebb1b4cf886b1b38d18 SHA-1: b63bb4d29bd83f0cd850c335dddbe5eb851cf201 SHA-256: 40768ebef10391077745699fa7d16e427726efbedd6263e9639372c416d0dcb1
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URIs, https://jacksth.ru/wix?keyword=mr+yang+calculus, is likely part of this scheme. The document body is heavily obfuscated and does not provide clear instructions, but the overall structure and heuristics point towards a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jacksth.ru/wix?keyword=mr+yang+calculus PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366661/normal_6023bf7d73438.pdfIn PDF document text
    • http://lapebev.iblogger.org/11009841942.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376879/normal_5feeee1c774e0.pdfIn PDF document text
    • https://lijupumo.weebly.com/uploads/1/3/4/4/134496400/d40f52.pdfIn PDF document text
    • https://dawutika.weebly.com/uploads/1/3/1/4/131407504/8522286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443801/normal_5fdb772535418.pdfIn PDF document text
    • https://gojatoxemoniro.weebly.com/uploads/1/3/4/8/134894745/8dac21.pdfIn PDF document text
    • https://tosoremekik.weebly.com/uploads/1/3/4/7/134771766/2160874.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415544/normal_5fe10aa083ca7.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/iGDjbhg/wupikiwisajerezeleb.pdfIn PDF document text
    • https://tusuwijajibu.weebly.com/uploads/1/3/4/5/134517525/e9252aa48e86feb.pdfIn PDF document text
    • https://marotebage.weebly.com/uploads/1/3/4/7/134712984/siwosejazitile_fawuzew_balefolokizos_radoxubejug.pdfIn PDF document text
    • https://fojowixejomad.weebly.com/uploads/1/3/2/6/132681658/50eabd6bd27b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://majukukosiw.rf.gd/bloomberg_market_concepts_questions_answers.pdfIn PDF document text
    • http://wowimes.epizy.com/saxunilodewidisesuw.pdfIn PDF document text
    • http://wetoxikilosawa.epizy.com/female_reproductive_system_terms_worksheet.pdfIn PDF document text
    • http://xewaxal.epizy.com/acoustasonic_150_manual.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD253 5072 bytes
SHA-256: 1d254085f8b24b59c674e32bbd55a23dcd8d13bd4ed7e5b147557af3cd71d221
font_01_sfnt_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 10336 bytes
SHA-256: 5e0f1a414f0c59d16f8d2ad254aa6a8b0df4b37281fe5fb34553a10f557fcc68

Open this report in the interactive analyzer, or submit your own file for analysis.