Malicious PDF — malware analysis report

Static analysis result for SHA-256 b14c0b8e5cebbd53…

MALICIOUS

PDF

72.5 KB Created: 2021-02-25 20:40:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bcb81f90bebc10f69dd6bff437ff1e6c SHA-1: d2d7f9e90da4558fdb445a5f3639d0cbcb828c51 SHA-256: b14c0b8e5cebbd535bc2a7c796ad429a9d5ce12620fe7effc51bfc04cc7406c4
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 a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/award?keyword=how+build+a+shooting+bench PDF link annotation
    • https://jufozawuvinuxak.weebly.com/uploads/1/3/5/3/135326647/soxojozelowote.pdfIn PDF document text
    • https://sixisamut.weebly.com/uploads/1/3/5/3/135308299/9911069.pdfIn PDF document text
    • https://gaburidukir.weebly.com/uploads/1/3/4/4/134463400/fonexesilumo_tapazugojix_rasojex.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/basketball_shooting_drills_for_high_school.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/temejinevofawosolep.pdfIn PDF document text
    • https://jinijazi.weebly.com/uploads/1/3/4/6/134668286/jolugaf.pdfIn PDF document text
    • https://ribovaboj.weebly.com/uploads/1/3/0/7/130775049/76ff43a2b93e.pdfIn PDF document text
    • https://buzoxebujodi.weebly.com/uploads/1/3/5/9/135971705/weselum.pdfIn PDF document text
    • https://nazizuvadonilu.weebly.com/uploads/1/3/4/5/134590702/7ee778400e0f.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/why_does_my_ukulele_strumming_sound_bad.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/33373187469.pdfIn PDF document text
    • https://kererivodukeje.weebly.com/uploads/1/3/5/3/135303009/afd0379587.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/tarudutu.pdfIn PDF document text
    • https://ralufuluwifo.weebly.com/uploads/1/3/0/9/130969066/zibod_balowavufeker_movosavizexun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000df9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9F 5296 bytes
SHA-256: cb22b560bf0a73e946b70825fad439894eebb67ef71b69909d0072f0d1a67142
font_01_sfnt_off0000f1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B3 10264 bytes
SHA-256: 1b27365a44740f07392c496689d435654cf1919fae648317a8e7e672a903da27

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