Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5c7a0d2fb9e0b9…

MALICIOUS

PDF

76.3 KB Created: 2021-04-03 02:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4996be4f97b9e59635e7ae162a6e5305 SHA-1: d4cf7a2407d640eb677686ba87e92f3418c872c4 SHA-256: 2a5c7a0d2fb9e0b97a0276216a9bbf869f8949c650d3aa158feabd44b601aed4
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, pointing to various PDF files on disposable hosting. ClamAV and an ML classifier also flagged this file as malicious, specifically as a phishing trojan. The primary purpose appears to be directing users to potentially malicious content or for SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/strik?utm_term=starting+strength+training+over+40 PDF link annotation
    • https://cdn.sqhk.co/zarejesorufo/9idhejg/43524120343.pdfIn PDF document text
    • https://vijapuloxo.weebly.com/uploads/1/3/0/7/130775263/1769764.pdfIn PDF document text
    • https://genoduvule.weebly.com/uploads/1/3/1/4/131407197/2142789.pdfIn PDF document text
    • http://manthoughtswebsite.website/zoxagomofomurijugebi2ajyn.pdfIn PDF document text
    • https://cdn.sqhk.co/zinoliwomi/jGhgcif/luwumagonoxenisi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467936/normal_60679284d829a.pdfIn PDF document text
    • http://luminar3-download.xyz/35973641842uf4wa.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/9jbSL3Q/yi_mini_dash_car_camera.pdfIn PDF document text
    • https://cdn.sqhk.co/makulowujip/LVKhcje/jenogisez.pdfIn PDF document text
    • http://webmastervlad.ru/plant_physiology_impact_factor_2016jck64.pdfIn PDF document text
    • http://baffer-shop.space/filmywap_2019_bollywood_movie_kabir_singhezqft.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/hd0jhhf/zombie_run_long_island_2019.pdfIn PDF document text
    • http://crispyset.online/kenmore_freezer_door_open_alarmdzhjn.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/i9Jgjje/jazurowa.pdfIn PDF document text
    • https://cdn.sqhk.co/timosavegug/DghNhav/33024813624.pdfIn PDF document text
    • https://torurukiruxo.weebly.com/uploads/1/3/4/5/134529807/tuzajimetog_xamasiboti_dutaxefib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420449/normal_6019dab71ec82.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/fjfvhaW/56643278670.pdfIn PDF document text
    • https://cdn.sqhk.co/movijomo/hcjjjeN/yeezy_v2_hyperspace_release_date.pdfIn PDF document text
    • https://cdn.sqhk.co/dolafita/jajfxey/sawanadolijopa.pdfIn PDF document text
    • https://cdn.sqhk.co/xutijexop/0jhub5F/cuba_travel_ban_history.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000edb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB7 5308 bytes
SHA-256: 3945488bed184011aadc3bc4c75b823d0117c42dd927f96eb18d96b503567e4a
font_01_sfnt_off0000ffc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 10404 bytes
SHA-256: 90900766712098aa25cbf61ea9a7138b28d37e65e6fb7223eb475f6c905200ff

Open this report in the interactive analyzer, or submit your own file for analysis.