Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e3e931d9b632386…

MALICIOUS

PDF

77.9 KB Created: 2021-05-31 14:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0eae7e83afa0bc1b4acadc7737a990a5 SHA-1: 8b9a13a9154e56359e7cbedf767ac7b79872a5b1 SHA-256: 2e3e931d9b632386a7e425ed58fa235757e883be5fc97c761a573f39e3f0b094
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The document body is heavily obfuscated and unreadable, but the presence of numerous external URLs indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/123?utm_term=bullet+force+pc++free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418558/normal_602b64b3c724b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389603/normal_6045e793cc72a.pdfIn PDF document text
    • https://zifotafevulifo.weebly.com/uploads/1/3/4/6/134648418/8057892.pdfIn PDF document text
    • https://xepozusaba.weebly.com/uploads/1/3/4/6/134613274/xitugu_nerunubafexizi_wimarirazom_buxerak.pdfIn PDF document text
    • https://nevimemiwuje.weebly.com/uploads/1/3/5/3/135332714/d37d4910.pdfIn PDF document text
    • https://vixekilawuta.weebly.com/uploads/1/3/4/3/134305586/5749536.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386086/normal_600d99aa49e32.pdfIn PDF document text
    • https://pejejejepo.weebly.com/uploads/1/3/2/6/132682076/7605662.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/vufixedisavomi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401697/normal_6038bdbe4aea0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530937/normal_60183d3018ab5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_60540812249ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411489/normal_5fdae1856b0c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497666/normal_605d84560233d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_60638af2686ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424007/normal_60206139218f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475725/normal_5fde4d7b6d001.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403119/normal_5fc7214e4c8c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e73f4d0b-5ce0-48d6-8d2a-6caf44fe1f9a/tuvarujoramojoku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa494037-591d-4d8b-97a2-1c87be972b49/vw_umhlanga_service_department.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfed2873-d24d-4238-bc84-911f5fa4ed4e/meade_autostar_suite_astronomer_edition_software_download.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_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 4668 bytes
SHA-256: 4ca6076391ec9659de29ba0dd4eefd2b4493ba9c79b490e7c8d3b263e1781be3
font_01_sfnt_off00010157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10157 12272 bytes
SHA-256: c3f657c832fc2644dc5faa81235ad2943e5105b5f16b7883a9871cd93fcbc99b