Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a4aa27661c56ea…

MALICIOUS

PDF

79.5 KB Created: 2020-12-01 00:21:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 012b0dc7fe1ca9137338b800aefe69ed SHA-1: d29bcbac94e1c34183fe2e4ab35c42cb69fedce2 SHA-256: 68a4aa27661c56eadb3cfa53fb7102eeb5d32ccf155c8127a59632b81c1ac43a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffine.ru/strik?utm_term=dyna+glo+kerosene+heater+manual PDF link annotation
    • https://migufakugiguxob.weebly.com/uploads/1/3/4/5/134579218/wewidogodapov_kupinogetaleda_medefatuni.pdfIn PDF document text
    • https://xosotemup.weebly.com/uploads/1/3/4/3/134367608/542ed34b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368249/normal_5f8f9b4625e3f.pdfIn PDF document text
    • https://woxujinugav.weebly.com/uploads/1/3/4/3/134305359/254954.pdfIn PDF document text
    • https://tufiganifipira.weebly.com/uploads/1/3/4/3/134310976/zizikasenejanur.pdfIn PDF document text
    • https://nibuxapevu.weebly.com/uploads/1/3/4/6/134601724/dixepizonikoxadobeb.pdfIn PDF document text
    • https://dumitekajeru.weebly.com/uploads/1/3/0/7/130740207/5d2e83babdd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370286/normal_5f95e0875281d.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/mofamavi_salakesu_sesiguno_rogut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402717/normal_5f9e4ef505652.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/43f4e8fa-4c31-4e0b-ab30-6830abd93e18/intrinsic_fermi_level_of_silicon.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_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 5264 bytes
SHA-256: ff0fe27e093b4205ab67df5406f36ee8a4b18e2f7c67f21123adfd49b0f8542a
font_01_sfnt_off00010add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADD 11252 bytes
SHA-256: 001c23418d93f2acdeafa441bd3c107e714f2c345a4a56c54d9b28bcee71b780

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