Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7ee5b59bd8356b…

MALICIOUS

PDF

73.3 KB Created: 2021-04-24 04:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4b7243c27a937de2aa314684e5b8edeb SHA-1: d2a8695eb51801382c57a363086ce03ca0cd9cbf SHA-256: 7d7ee5b59bd8356b460885116e02f93dc0107fab93f2891065ebb26974cb9252
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The primary URL, 'https://baarspo.ru/strik?utm_term=fedex+customer+service+representative+interview', is presented in a context related to FedEx interviews, a common lure for phishing. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly indicate malicious intent, likely to redirect users to malicious websites for credential harvesting or further malware delivery.

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://baarspo.ru/strik?utm_term=fedex+customer+service+representative+interview PDF link annotation
    • https://cdn.sqhk.co/kawaniroti/cfcjhif/55060906024.pdfIn PDF document text
    • https://cdn.sqhk.co/feletitami/jhjeOq5/tapetosimewab.pdfIn PDF document text
    • https://cdn.sqhk.co/palugalanivo/gg12ic5/fotokepemopulaf.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/djdWggi/burger_shoppe_27th_ave.pdfIn PDF document text
    • https://cdn.sqhk.co/wunemuruk/gefjbgi/at_t_watch_tv_premium_channels.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liroporegabofi.epizy.com/vexetitozinevipo.pdfIn PDF document text
    • http://dusalotiwuje.rf.gd/nejajozidixibejolujik.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_6e22846f6b504f05b6b022d96af34a36.pdf?index=trueIn PDF document text
    • http://tegolekigi.epizy.com/98431000216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08f43e05-c149-4087-8c48-0147bdb0ff3f/74738852241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd47353d-3f59-4459-b8fd-cea961ce4620/denon_avr_1910_receiver_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/jarekidigelekofiba.pdfIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_56bbadbd4500404ab8f26c5783436624.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d6b382c-feb5-4d09-8b4e-de3fb7be072b/black_and_decker_edger_blades_le750.pdfIn PDF document text
    • https://s3.amazonaws.com/muvojugejoxip/19148381384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/996e4818-30a2-4e62-945c-54cd5036f575/relazixere.pdfIn PDF document text
    • http://misosemarimo.rf.gd/rubawetosozavakufeni.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/xulaka.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/bakafozamit.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_off0000e16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16F 5364 bytes
SHA-256: c052ec47baeaaff3894a71e68e62ee5604fd5f138855aa43768bcf759fd859e4
font_01_sfnt_off0000f3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AA 10652 bytes
SHA-256: 1cc3d1610ae7154721f3198e0f241613413c00cdf474c57c6d44a8e44e3ac3dc

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