Malicious PDF — malware analysis report

Static analysis result for SHA-256 d758a19f549859d9…

MALICIOUS

PDF

72.4 KB Created: 2021-01-20 10:28:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 94d7486fc95924f5bbe1aada825bce6e SHA-1: ef633aeba9a18c336ceeb53664be0424b3a7576b SHA-256: d758a19f549859d9c88dd3e19ebb5f843426b405cf2a515906d8a8612516d0f1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links, many hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and a link farm on disposable hosting points towards an attempt to redirect users to potentially harmful 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://leonvi.ru/123?utm_term=30.3+the+digestive+system+answer+key PDF link annotation
    • https://fovojewonot.weebly.com/uploads/1/3/4/6/134669065/rejiwixebojeroz-tuzorujozuzabad-pawizoxonemejut.pdfIn PDF document text
    • https://ludopugadataz.weebly.com/uploads/1/3/4/7/134709803/2e8612.pdfIn PDF document text
    • http://getizibibi.22web.org/lusugufomogelavotozig.pdfIn PDF document text
    • https://zemabata.weebly.com/uploads/1/3/4/6/134677216/lumiza.pdfIn PDF document text
    • https://vutakajar.weebly.com/uploads/1/3/4/8/134896426/vuzaratijapexex.pdfIn PDF document text
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/rigar.pdfIn PDF document text
    • https://lekikibobasiva.weebly.com/uploads/1/3/5/3/135350768/vakoruparujir_nijanev_sewote_dodit.pdfIn PDF document text
    • http://pepirizibizedel.22web.org/kegco_conversion_kit_guide.pdfIn PDF document text
    • https://femezusuf.weebly.com/uploads/1/3/1/6/131606597/jopesagofimejunutune.pdfIn PDF document text
    • https://limofagis.weebly.com/uploads/1/3/4/6/134640762/2a0a2fcb013c12f.pdfIn PDF document text
    • https://diwowure.weebly.com/uploads/1/3/4/5/134592565/4258106.pdfIn PDF document text
    • https://bunivuwavimi.weebly.com/uploads/1/3/4/7/134706582/leturizeluzibi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zamonile.epizy.com/sheep_brain_dissection_lab_report.pdfIn PDF document text
    • http://mujawonevafo.rf.gd/62359919197.pdfIn PDF document text
    • http://potolonufe.epizy.com/hypothyroidism_in_down_syndrome_screening_guidelines.pdfIn PDF document text
    • http://jonufinufezo.epizy.com/15153671076.pdfIn PDF document text
    • http://bividit.rf.gd/pojutimixeg.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_off0000dcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFE 5768 bytes
SHA-256: 677f1f468bea5c69a0813ec6d7e535d4b1cf457d2044b058fa3c597196903f9d
font_01_sfnt_off0000f094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF094 10480 bytes
SHA-256: 175418cd7feafb780bf0413d014ec1ba3a584af8e3580a56e4268ce9f738a36e

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