Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e3b8415a660515…

MALICIOUS

PDF

94.2 KB Created: 2021-06-10 06:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: fdcdf7f933f657345ce03561450bbd02 SHA-1: 30e8f8377675e33726646c7cdbd714307183aa32 SHA-256: e2e3b8415a660515d60e902e3a295f43890ac0f1fba32eac0fbe07c7f8c4f66f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating it functions as a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is a tactic to distribute malicious content or lead users to phishing sites. The ML classifier and ClamAV detection further confirm its malicious nature, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://smidgel.ru/pbw?utm_term=zero+first+second+third+conditionals PDF link annotation
    • https://sijotifibiga.weebly.com/uploads/1/3/0/9/130969940/7390991.pdfIn PDF document text
    • https://bobuvuxatuf.weebly.com/uploads/1/3/7/5/137519798/5710145.pdfIn PDF document text
    • https://pelabinal.weebly.com/uploads/1/3/1/3/131379552/zonetaxalubuwunenipi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474223/normal_5ff71bf637630.pdfIn PDF document text
    • https://vixagudidiw.weebly.com/uploads/1/3/0/7/130775505/b0ef5.pdfIn PDF document text
    • https://juwomazitebuden.weebly.com/uploads/1/3/1/4/131414743/toguzave.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447903/normal_60232cac4c807.pdfIn PDF document text
    • https://zufuleruzu.weebly.com/uploads/1/3/1/6/131637307/4275a5d3c13.pdfIn PDF document text
    • https://wirevoge.weebly.com/uploads/1/3/1/8/131856771/favelako.pdfIn PDF document text
    • https://lilikegemuvil.weebly.com/uploads/1/3/1/3/131398424/debezinuborikazu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393183/normal_5fdf2e149ee04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383460/normal_602a09ae531bc.pdfIn PDF document text
    • https://wobofosowipifir.weebly.com/uploads/1/3/0/7/130776138/xebidumetomok-gumurukikuret-sabodonuxewag.pdfIn PDF document text
    • https://xagomutub.weebly.com/uploads/1/3/4/3/134321984/4bb84fec33341d2.pdfIn PDF document text
    • https://vumopiwerelo.weebly.com/uploads/1/3/4/7/134730258/bavuwebefujelizukit.pdfIn PDF document text
    • https://jiwifibim.weebly.com/uploads/1/3/1/4/131437351/kobubikuboridulusus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495846/normal_600f475416fc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418368/normal_6005495752ed3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375518/normal_60366cb0cceb3.pdfIn PDF document text
    • https://jamibada.weebly.com/uploads/1/3/1/1/131164428/jerejunewevagog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382196/normal_6060860ba01d2.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/7bdc992e-b1a9-4438-9f98-be4950a52e32/skyrim_royal_vampire_armor_replacer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d5631bc-1912-4610-86df-de216e120ee4/oracle_of_shadows_and_light_guide_book_free_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_off000135e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E2 5068 bytes
SHA-256: 0bcb5b54ffd209962d2028a1edddc3068c583e5cfa2dd42bc9414bee0fc457a6
font_01_sfnt_off0001471e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471E 10532 bytes
SHA-256: 9c8fc7183e5a6adcb1568808f282a465f2da8a9777852295e5cf2c2a4aadb159