Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4924e4db98bdd06…

MALICIOUS

PDF

80.1 KB Created: 2021-03-03 17:28:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 32f3f9a8c8acf04ff37fe392e5f603b6 SHA-1: d523fbae0ad913cc4ad7acdc1dc4d0e7d3fb0189 SHA-256: f4924e4db98bdd06dcf279d876e6e0039a5f89a216a5af5f1d11b6afb1f0e6d3
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 pointing to disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious content.

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://jottigo.ru/award?keyword=how+to+wind+a+400+day+clock PDF link annotation
    • http://feyakast.online/bivegaz8fh8n.pdfIn PDF document text
    • http://fruitslope.online/introduction_to_computer_information_systems_4th_editionksxk8.pdfIn PDF document text
    • http://wordsideget.top/18985154831x3aoc.pdfIn PDF document text
    • https://mavezuwunokil.weebly.com/uploads/1/3/4/6/134627141/godeguna.pdfIn PDF document text
    • https://dodoxatufasiw.weebly.com/uploads/1/3/2/6/132681482/jadup.pdfIn PDF document text
    • https://sobiwololisa.weebly.com/uploads/1/3/0/9/130969717/lisuzumadamegasaz.pdfIn PDF document text
    • http://azules.ru/angry_birds_rio_hack_apkkowk3.pdfIn PDF document text
    • http://card2card.live/nabasifivasiwiluxisonagtkydd.pdfIn PDF document text
    • http://xtina.online/temporal_lobe_anatomy06zb9.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/guvafaketexiv.pdfIn PDF document text
    • https://notetezowinebax.weebly.com/uploads/1/3/6/0/136019470/boweto-mubalifarit-putuj-latuvifuv.pdfIn PDF document text
    • https://sagiwotagemo.weebly.com/uploads/1/3/1/8/131871993/pininemuvuj-lozozofi.pdfIn PDF document text
    • https://murexaxinafol.weebly.com/uploads/1/3/4/4/134456221/1b70fe6e6de9.pdfIn PDF document text
    • http://wiinorama.space/susibawopuvozudomelospkwlc.pdfIn PDF document text
    • http://arm-watch3.club/30592832002teo17.pdfIn PDF document text
    • https://penonogam.weebly.com/uploads/1/3/4/0/134012545/zoforepikinobun.pdfIn PDF document text
    • https://rozutawupev.weebly.com/uploads/1/3/2/6/132695629/pumadiketitofabi.pdfIn PDF document text
    • https://mafopovum.weebly.com/uploads/1/3/4/3/134322216/7a7cbc25.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xidazeze/bitetifuze.pdfIn PDF document text
    • https://s3.amazonaws.com/gaxuremewuger/20104762682.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_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 5108 bytes
SHA-256: 79d095eefab6b0f7f8c2b08d1fb538588f41aaca9dd353d4a6007c09d9727fa7
font_01_sfnt_off00011078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11078 10208 bytes
SHA-256: 9ae1bd47c4a7a1c1f9a021594f36bfb21b6105afeff547c77f12eb45d3470ef1

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