Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd5272fdb9acf95b…

MALICIOUS

PDF

76.4 KB Created: 2021-06-03 10:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f1f3e55c740159baef19bb2801d16f54 SHA-1: 0498ddf48fd11839a601f85294950c632406f6be SHA-256: fd5272fdb9acf95b82eb22c283b33a5f722296a42aa3ad90761313422ba78aaa
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting services. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or SEO spam. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious or deceptive content.

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://lozipotod.ru/123?utm_term=guidewire+stock+yahoo+finance PDF link annotation
    • https://ruzunaxatan.weebly.com/uploads/1/3/4/3/134340268/5936912.pdfIn PDF document text
    • https://kalabuzamebuku.weebly.com/uploads/1/3/4/3/134339718/39a61d826.pdfIn PDF document text
    • https://dubigeta.weebly.com/uploads/1/3/5/3/135341625/xorolavobi_nulelesa_begodimod_bokiterular.pdfIn PDF document text
    • https://nakosedamewa.weebly.com/uploads/1/3/4/6/134612328/boget.pdfIn PDF document text
    • https://pefekebemapufug.weebly.com/uploads/1/3/4/3/134370705/5752714.pdfIn PDF document text
    • https://zozabamefopofa.weebly.com/uploads/1/3/4/2/134234868/nizopamun.pdfIn PDF document text
    • https://zatetemaf.weebly.com/uploads/1/3/4/4/134494585/kapodekuximotija.pdfIn PDF document text
    • https://jizojalagakamu.weebly.com/uploads/1/3/4/8/134886497/piloxokoga.pdfIn PDF document text
    • https://saselafe.weebly.com/uploads/1/3/4/8/134894966/vulamuf.pdfIn PDF document text
    • https://domoposuselof.weebly.com/uploads/1/3/4/7/134720049/2f09861.pdfIn PDF document text
    • https://menosakisidibus.weebly.com/uploads/1/3/5/3/135391165/ac77f847cefd.pdfIn PDF document text
    • https://xuvunigito.weebly.com/uploads/1/3/1/1/131164310/gezezobafetomijo.pdfIn PDF document text
    • https://vijarijun.weebly.com/uploads/1/3/2/6/132695649/a67066e84c.pdfIn PDF document text
    • https://pobogovowot.weebly.com/uploads/1/3/5/3/135323888/5780120.pdfIn PDF document text
    • https://sekilulijafos.weebly.com/uploads/1/3/1/4/131438177/nipiled_doxijotilesos.pdfIn PDF document text
    • https://baxodibidixajit.weebly.com/uploads/1/3/5/3/135311382/e72f19a905b5d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xedidovetaw.pbworks.com/w/file/fetch/144417126/download_game_sword_art_online_infinity_moment_english_patch_2.0.pdfIn PDF document text
    • http://degenazi.pbworks.com/f/dujemodoranebotowajet.pdfIn PDF document text
    • http://gitixofipoxu.pbworks.com/f/how_to_install_anti_cheat_for_fortnite.pdfIn PDF document text
    • http://jopamedet.pbworks.com/f/20141194298.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/f/8776626252.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_off0000ec52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 5368 bytes
SHA-256: 9c72b1c058c8b7fdb5dfc633364e2ae1c685c53d643c44d95c9693dc8f25ea69
font_01_sfnt_off0000feb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB1 11064 bytes
SHA-256: 362906cc56a9e193604c81824d0f264b4e01a4fce4a5b0194efd9f0f10d383d0