Malicious PDF — malware analysis report

Static analysis result for SHA-256 804bb99a24f6389d…

MALICIOUS

PDF

136.5 KB Created: 2021-06-11 01:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bb19bc49f75bc4752c946f6de7754b3 SHA-1: d3a8a5569e6513c7ed825049f13d8e377b7a3672 SHA-256: 804bb99a24f6389da722385656ef670fba5938f0bcd1f6abe9a33e36a84e82c2
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/pbw?utm_term=download+miracle+box+thunder+edition
    • https://wifusudufasebo.weebly.com/uploads/1/3/5/9/135992472/zosomajababopabavumu.pdf
    • https://gifonoxudofi.weebly.com/uploads/1/3/4/3/134322056/a49f48.pdf
    • https://wifevotus.weebly.com/uploads/1/3/4/8/134897576/wufiv.pdf
    • https://gepulepefuxogu.weebly.com/uploads/1/3/2/6/132683228/wosiji-selokukutora-kovatum.pdf
    • https://dariwatipizodaf.weebly.com/uploads/1/3/5/3/135323996/luvaxizegenale.pdf
    • https://nafusifino.weebly.com/uploads/1/3/4/6/134615437/13463.pdf
    • https://rubopawine.weebly.com/uploads/1/3/1/0/131070645/baac921d.pdf
    • https://namuxewanazojo.weebly.com/uploads/1/3/4/2/134266474/e4b3012f78d68.pdf
    • https://sedarujewajoto.weebly.com/uploads/1/3/0/9/130968957/2976862.pdf
    • https://puxivulikuvudet.weebly.com/uploads/1/3/4/6/134663564/7bf368425b0f28.pdf
    • https://lorufolirosob.weebly.com/uploads/1/3/4/5/134584190/fezewexugu-vebamuzo-susedin-gegaj.pdf
    • https://novatoful.weebly.com/uploads/1/3/0/9/130969934/a34e7605d.pdf
    • https://goguribepolim.weebly.com/uploads/1/3/0/7/130739596/66b54a83a2a219.pdf
    • https://nilumasukezag.weebly.com/uploads/1/3/4/4/134401113/tizumabobitete.pdf
    • https://nenafusorez.weebly.com/uploads/1/3/1/4/131453248/2894390.pdf
    • https://bixivikikem.weebly.com/uploads/1/3/7/5/137504554/zijupusipij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://ridelox.pbworks.com/w/file/fetch/144476313/sokadexekusolalon.pdf
    • http://sizolasipape.pbworks.com/w/file/fetch/144412803/freundlich_adsorption_isotherm_problems.pdf
    • http://ruxafonan.pbworks.com/f/wufigemuwiropalez.pdf
    • http://sewafebi.pbworks.com/f/rawotazifojeduwi.pdf
    • http://razodegotit.pbworks.com/f/12419372066.pdf
    • http://wimarolos.pbworks.com/w/file/fetch/144746277/how_to_write_a_personal_narrative_6th_grade.pdf
    • http://vejivab.pbworks.com/w/file/fetch/144436179/tobepirixeguj.pdf
    • http://kafunujazuwo.pbworks.com/f/fundamentos_de_metodologia_cientfica_lakatos_2010.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001add2.bin
9efb9c6d38f0a1136df668e8796876aec166249e163581eb742371cd29b5566a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADD2 9756 bytes
font_01_sfnt_off0001cd06.bin
e7faa38aa8eeb6a4bed31ab10dde0e4e2f04dfe63894de666349230900d89625
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD06 5300 bytes
font_02_sfnt_off0001def7.bin
118e7758dc36330f4619f4cac1f0856e05f878422065cbe2c847770c30d4f0eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DEF7 12788 bytes
font_03_sfnt_off000207a5.bin
4a212b9ffef989fdcb6547b1358d15ded50d0f8085ccb7e11968ea8c8ff30a87
pdf-font-stream PDF embedded font (sfnt) at offset 0x207A5 2792 bytes