Malicious PDF — malware analysis report

Static analysis result for SHA-256 123f21d174021f4f…

MALICIOUS

PDF

75.0 KB Created: 2021-03-01 18:56:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9e2251039c00dd12c9b2a438f0fdb872 SHA-1: 0b25426d52a89f3f78cbcbb5c7406c5e05324cb0 SHA-256: 123f21d174021f4f27c7222cbb704b453862f61b520ede640c66f0da28ed2474
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to manipulate search engine results or distribute malicious links. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or SEO spam campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

Heuristics 6

  • 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 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://kuzutuzo.ru/award?keyword=honda+gc160+pressure+washer+5.0 PDF link annotation
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/376d8ba.pdfIn PDF document text
    • https://zekogogebiw.weebly.com/uploads/1/3/1/4/131453397/ponedawonikife_fawaligerazik_samosobifom_xakeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484835/normal_5ff3f46ee8952.pdfIn PDF document text
    • https://kavisovilige.weebly.com/uploads/1/3/5/3/135308643/bamuxapewavolo-zuputubezugene-jawiriji-nerojiridaneb.pdfIn PDF document text
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/2050470.pdfIn PDF document text
    • https://mokitapakajare.weebly.com/uploads/1/3/4/8/134885173/bc63af81dcd67.pdfIn PDF document text
    • https://gekitudofu.weebly.com/uploads/1/3/4/4/134403565/welat-mibegeserozase-fezutu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408176/normal_60333c823df25.pdfIn PDF document text
    • https://mujesazuf.weebly.com/uploads/1/3/2/3/132302915/lipotuzesubel-zefuzalelu-tuxedavijeka-nukutivu.pdfIn PDF document text
    • https://labudadujuw.weebly.com/uploads/1/3/1/6/131637223/1471290.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/87587261331.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390638/normal_5feb1a4d27f59.pdfIn PDF document text
    • https://wigobozigor.weebly.com/uploads/1/3/5/3/135345973/kedojepo_tikagoxiridopiz_vezugivomujizu_nupewun.pdfIn PDF document text
    • http://jushq.club/what_is_a_positive_linear_association99ngb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501963/normal_603973bf4618e.pdfIn PDF document text
    • https://sedezexe.weebly.com/uploads/1/3/4/3/134342112/sezepirigiwaxosi.pdfIn PDF document text
    • http://xamoxipuwizutux.scienceontheweb.net/let_us_come_boldly_to_the_throne_of_grace_niv.pdfIn PDF document text
    • https://memetunariva.weebly.com/uploads/1/3/1/4/131454345/gapuvekefeveliz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tixofimisupabev.onlinewebshop.net/wokugoradun.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8A 5860 bytes
SHA-256: eff6081c0ce65e73da6ba081ef4b79e111255632d1a6444832e7bdcd80bf318c
font_01_sfnt_off00010391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 10412 bytes
SHA-256: 44ff10576bab0caa6d5a239c79e9f6c6467da43fa2a636b1e6b9f9b48f8ab98b

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