Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dfb289ea93f5e5f…

MALICIOUS

PDF

87.2 KB Created: 2021-03-03 06:46:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7c3a0dac80a79889affa74eebfcc4962 SHA-1: d884183fec5ef01d09a3ee025cc95f80ac9dac5a SHA-256: 3dfb289ea93f5e5f1d6dddd6408cdc757a6cb79ec5209cf1f720f73b6c5d1c75
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=diagrama+de+fases+del+dioxido+de+carbono+explicacion PDF link annotation
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/zaverulufimafefaseda.pdfIn PDF document text
    • https://daxapiruxibi.weebly.com/uploads/1/3/2/7/132712323/xizudotozemivi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407299/normal_60095eb9c8a26.pdfIn PDF document text
    • https://vobawele.weebly.com/uploads/1/3/5/3/135334277/5795832.pdfIn PDF document text
    • https://nusevusigafub.weebly.com/uploads/1/3/1/3/131398220/7401110.pdfIn PDF document text
    • https://fewedujaso.weebly.com/uploads/1/3/1/1/131163653/rikuwek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_6038608b8af36.pdfIn PDF document text
    • https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/mevaxiwurobag.pdfIn PDF document text
    • http://fukerijinexin.mygamesonline.org/49060381866.pdfIn PDF document text
    • https://debegibur.weebly.com/uploads/1/3/4/3/134308456/f4f34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472488/normal_60034a0933444.pdfIn PDF document text
    • https://gubukaxonular.weebly.com/uploads/1/3/5/3/135349028/79dd4042b4e.pdfIn PDF document text
    • https://mapatujil.weebly.com/uploads/1/3/1/4/131454051/2867439.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444095/normal_603b38b07a10a.pdfIn PDF document text
    • https://jipuzalo.weebly.com/uploads/1/3/4/6/134693454/xufufuda-menefe-fuvumazizevaw.pdfIn PDF document text
    • https://pimipile.weebly.com/uploads/1/3/4/8/134883166/lelidirevipin-zuworepa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duxegejuw.atwebpages.com/37391907429.pdfIn PDF document text
    • http://radiviwix.onlinewebshop.net/living_forward_aba_marion_indiana.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/59649050462.pdfIn PDF document text
    • http://lofunadex.myartsonline.com/hp_motherboard_lan_drivers_for_windows_xp_free_download.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_off000111e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E8 5684 bytes
SHA-256: 81e881d2529f5f537f39b4f731ef53810792b0b9070b2d40b523d2169d278ae9
font_01_sfnt_off00012532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12532 12252 bytes
SHA-256: d41a6da158fa96886447e874c077fe80ffbb8bb140b5fbae380f38c0138d8092

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