Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a3cd3e53ab41fa…

MALICIOUS

PDF

77.2 KB Created: 2021-03-19 09:00:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a13d43f8eee25e989242e41ef266e100 SHA-1: a1a22b58dfdd8cc73f23112eef0056cc59712443 SHA-256: 87a3cd3e53ab41fa80d71d96352f7c341c92554b5876ce5ed939f5b3e3559a25
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 0.9991

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/wix?keyword=famous+bob%2527s+pizza PDF link annotation
    • http://getepitisux.mywebcommunity.org/black_knee_ripped_baggy_boyfriend_jeans.pdfIn PDF document text
    • http://gumidaz.medianewsonline.com/71220919107.pdfIn PDF document text
    • https://kowizonijate.weebly.com/uploads/1/3/5/9/135991151/8582460.pdfIn PDF document text
    • http://talemine.getenjoyment.net/what_is_the_fuel_oil_mixture_for_a_chainsaw.pdfIn PDF document text
    • https://jewolitef.weebly.com/uploads/1/3/4/0/134016805/64c8f4b88a7a.pdfIn PDF document text
    • https://retariluwefise.weebly.com/uploads/1/3/4/8/134858211/6249760.pdfIn PDF document text
    • http://kepuxom.mypressonline.com/35601426178.pdfIn PDF document text
    • http://rumigiwataj.getenjoyment.net/xeduxasewigefaralu.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/vifexalusomegezobugume.pdfIn PDF document text
    • http://muvibigi.22web.org/venikuxufesurob.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/3339387854.pdfIn PDF document text
    • https://viduxetejogat.weebly.com/uploads/1/3/4/6/134600114/movaxetip-sijabogupi-pebikedos-xexin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wesatume.atwebpages.com/52982716948.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd21adf4-5b64-41e0-83b8-6c1fce579f5e/sligh_grandfather_clock_chimes_wrong_hour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1430b55e-8095-4972-ad19-8aed88c40648/sorajiwokelufoborine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d08f89e-71a1-44ae-a97e-72b2afa01f93/68751285814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70ffb298-1320-4f04-b3a5-2eb299dbb60f/how_much_does_the_average_computer_programmer_make.pdfIn PDF document text
    • http://kimufigekufeta.rf.gd/fitasujexitifugil.pdfIn PDF document text
    • http://dulubuli.rf.gd/durozaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/470544a4-c50f-44ea-8e71-f9402a750460/buzoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01a2d41d-b167-4bae-aeb5-4b7ca6d65e5f/kejivot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4ea590a-1842-4d01-be7d-3b9aea0f1a39/47704168185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38be120b-22f6-4ddb-95b5-c347d0f110d3/gre_high_frequency_words_2020.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/m113_apc_in_vietnam_in_action.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_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 5016 bytes
SHA-256: 518889dc626e81997475750ec491624a2a43a448e4b0a01ee95db71521bbd3cc
font_01_sfnt_off00010328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 10692 bytes
SHA-256: 2414c8af009367090d318e6d23ea6975c416c1d5d7eceea7fb584289ba72defc