Malicious PDF — malware analysis report

Static analysis result for SHA-256 7011f47a0ad15fc1…

MALICIOUS

PDF

84.3 KB Created: 2021-03-05 01:40:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a0e0132602dac39be85158e0f19babe3 SHA-1: 8dc8796ab9f5912ce53df9f1b40743ad908b4ea7 SHA-256: 7011f47a0ad15fc10f62ef900857a93f251e6cd96f17bb12445b1abc6c59571e
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to distribute malware or phish users. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a query about personality compatibility, which likely serves as a lure to entice users to click on the embedded malicious links.

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://pelibifir.ru/strik?utm_term=what+personality+type+am+i+compatible+with PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412573/normal_5ffa5cac45b71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427105/normal_6017cf4a4058a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426676/normal_6026a92e88d94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420906/normal_5fcf64656edee.pdfIn PDF document text
    • https://gawudizilox.weebly.com/uploads/1/3/5/3/135300959/fozufet.pdfIn PDF document text
    • http://vamoktin.ru/boundary_layer_in_fluid_mechanicsrgh63.pdfIn PDF document text
    • https://gunubamevozapub.weebly.com/uploads/1/3/3/9/133997290/58b6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488837/normal_603c20df17e1e.pdfIn PDF document text
    • http://cesaregaspari.com/chainama_college_application_formpfn92.pdfIn PDF document text
    • https://zolidejowifaw.weebly.com/uploads/1/3/5/3/135313364/0da0a51.pdfIn PDF document text
    • https://pesiwuveso.weebly.com/uploads/1/3/5/3/135392822/1326467.pdfIn PDF document text
    • http://ita-talia.fun/20278752618mygnw.pdfIn PDF document text
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/05f91a049c.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/06553626-5631-42f1-a583-60e8cb9bd21b/young_living_essential_oils_order_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdb1c10f-5dd4-4e91-ba6b-b1e3467dbb10/9827024036.pdfIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_0fb7fba2295f47adb2bc6fc61a7e7d00.pdf?index=trueIn PDF document text
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_5acfc281e83244cda608b67ffd95a382.pdf?index=trueIn PDF document text
    • http://ripivetozevulu.epizy.com/15440031760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d55b8da-ce09-476c-ae75-7f8755ba65d2/bissell_big_green_professional_carpet_cleaner_machine_rental.pdfIn PDF document text
    • http://siwodonodefofo.epizy.com/converting_area_units_worksheet.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_off00010ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA9 5520 bytes
SHA-256: 338a6624cc684632feb6dc22c4f33b54e75b0bbcaa6aade06811b6feb89c9421
font_01_sfnt_off00011f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F59 10708 bytes
SHA-256: 00b7ce8afecf8532b741332e7f006109397160081d2d690a906b94f844f03cc0