Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f969ad815314de…

MALICIOUS

PDF

89.2 KB Created: 2021-02-20 02:25:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b7058d73b3b5fa033d73ebdd0c1bc30c SHA-1: c005ea9c64b555c84c7f5241e588463c3359fec4 SHA-256: 77f969ad815314de28b8c0807b4f073b78742f19db91ce9948d23c69e6d395fc
244 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. It contains a large number of embedded URLs, forming a link farm, with many pointing to disposable hosting services. The document body is heavily obfuscated and appears to contain metadata related to 'wkhtmltopdf', suggesting it was programmatically generated to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wb?keyword=power%20book%20of%20ghost%20episode%202 In PDF document text
    • https://wulodegekejiwa.weebly.com/uploads/1/3/4/2/134266030/d27e8772d9.pdfIn PDF document text
    • https://jizojalagakamu.weebly.com/uploads/1/3/4/8/134886497/1335158.pdfIn PDF document text
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/xipigiloxu-puruzezoguruwo-komobewuz.pdfIn PDF document text
    • https://sezokifor.weebly.com/uploads/1/3/4/5/134596047/df9ee.pdfIn PDF document text
    • http://fowevuwakit.22web.org/apology_letter_for_poor_sales_performance.pdfIn PDF document text
    • https://pevarigemi.weebly.com/uploads/1/3/5/3/135303959/dodujilawupuf.pdfIn PDF document text
    • https://pumelagu.weebly.com/uploads/1/3/2/8/132814433/3588212.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jizofaludem.epizy.com/kuzex.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/adobe_premiere_6._5_effects_free.pdfIn PDF document text
    • http://tupusivamiguta.rf.gd/6204575642.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/pugamotojinekive.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 4508 bytes
SHA-256: bfd4bfdd8531d3b3f710e3bc764696fc0d7e21445c54f868ad838a942e41a46b
font_01_sfnt_off0000fe52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 5488 bytes
SHA-256: 069dc5f4a8107a172d2a81806efbc122d58df1d16f779978f73d250b3f74f3ff
font_02_sfnt_off0001110a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110A 1636 bytes
SHA-256: bfba50ad4feeef2c19d4e06de581bdd1d0139814ede4844fc3850d755643d398
font_03_sfnt_off00011943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11943 12404 bytes
SHA-256: eb82f3fde2b5ab3ab97e0b09af30d40dd57014e20f9ca5edbeec5ca391c2e6d1
font_04_sfnt_off0001419f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419F 16132 bytes
SHA-256: 4f6d6443d667672870c38ce4e1d364e29e61a0df6fd2d8217a47270b9fff04c9