Malicious PDF — malware analysis report

Static analysis result for SHA-256 d760a252daeffc72…

MALICIOUS

PDF

79.4 KB Created: 2021-04-09 12:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: acc982394c34fe27e16e30ebbcc8618f SHA-1: 526a6eeee420805508a7d52acc658a7076553ad1 SHA-256: d760a252daeffc72bfca4d4e1924f6eeceb76af567329c232d852dc1c4c93cb2
186 Risk Score

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 0.9992

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://pelibifir.ru/strik?utm_term=college+football+offensive+playbook+pdf PDF link annotation
    • https://nopirepogoduk.weebly.com/uploads/1/3/4/0/134095858/vovivomi.pdfIn PDF document text
    • http://rosativiwam.mypressonline.com/roloxasexu.pdfIn PDF document text
    • https://povefedonigo.weebly.com/uploads/1/3/1/6/131637150/jenakawakon-dutozisala-mefilase-vixerumixotafe.pdfIn PDF document text
    • https://jipunexekamu.weebly.com/uploads/1/3/4/5/134588935/3320401.pdfIn PDF document text
    • https://devigejijakefu.weebly.com/uploads/1/3/2/7/132740662/mizixoves_dirupajikamuxa.pdfIn PDF document text
    • https://sidugavumudoriz.weebly.com/uploads/1/3/4/9/134902227/puwonolabobuz.pdfIn PDF document text
    • https://jimiporumina.weebly.com/uploads/1/3/6/0/136088268/814835.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/xivezabux.pdfIn PDF document text
    • https://xowitato.weebly.com/uploads/1/3/0/7/130776358/jititerezulivuxi.pdfIn PDF document text
    • http://tuwimig.scienceontheweb.net/breakfast_at_tiffany_s_novel.pdfIn PDF document text
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/9cae01b13190.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bexumasifawej.epizy.com/handwriting_template_cursive.pdfIn PDF document text
    • http://papemekibe.rf.gd/litawalidewow.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/credit_report_explanation_singapore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ac8638-cff7-438c-9551-4dea3f046f54/vajaseladegopopozu.pdfIn PDF document text
    • https://s3.amazonaws.com/mejobu/rezulogewaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/461f1f9b-9805-451c-9a23-3e0395699c3c/jixeberu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe37cbe1-925b-4800-b138-841313bbddaa/first_alert_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d14438f3-4e01-459b-9b77-6318f5e3befe/tp-link_tl-wa850re_universal_wifi_range_extender_instructions.pdfIn PDF document text
    • http://jemejuzot.epizy.com/grand_theft_auto_android_app_free.pdfIn PDF document text
    • http://diladamosune.rf.gd/walmart_everstart_maxx_reviews.pdfIn PDF document text
    • http://bulusibefu.epizy.com/famolo.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/videoscribe_app_for_android.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_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 5384 bytes
SHA-256: b5f6ee59617bd5bfa70d94afb46461c4f4daa1c73dad81677b96d94e25135066
font_01_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 10764 bytes
SHA-256: 55a000f361f1feee3b59a7388e29634196cc2d9e904dbfdc2950686954e2f4d7