Malicious PDF — malware analysis report

Static analysis result for SHA-256 c389402382328364…

MALICIOUS

PDF

70.9 KB Created: 2021-03-15 09:21:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cd368753243a684b685e8f31d8b8a97f SHA-1: dcddfa471ba83cd8b15029170c246e19e9adad50 SHA-256: c389402382328364d1281cb8aad0d590d4307a970c1b83dad4be9c0a736664f6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=bbc+good+food+guide+carrot+salad PDF link annotation
    • https://sedozexejelem.weebly.com/uploads/1/3/1/8/131871533/8225368.pdfIn PDF document text
    • http://show-visitor.xyz/6673865806qf49i.pdfIn PDF document text
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/zigik.pdfIn PDF document text
    • https://mafexanilexa.weebly.com/uploads/1/3/0/7/130739060/f07242be.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/mandated_reporter_training_quiz_answersj8u19.pdfIn PDF document text
    • https://kaledawuvilef.weebly.com/uploads/1/3/4/7/134727412/titumoxuzevi.pdfIn PDF document text
    • https://karujelibofab.weebly.com/uploads/1/3/1/4/131406149/6722576.pdfIn PDF document text
    • http://ledy66.net/15979469760ps6ox.pdfIn PDF document text
    • http://dibuxovowo.iblogger.org/blockman_go_apk_1._9._16.pdfIn PDF document text
    • https://dolujete.weebly.com/uploads/1/3/4/6/134674842/90c45730153f.pdfIn PDF document text
    • https://nuvusutapisi.weebly.com/uploads/1/3/4/4/134460305/telurizusamo_dupuraxojime.pdfIn PDF document text
    • https://kobuwejen.weebly.com/uploads/1/3/0/8/130873730/xefanamarojowe_gofibisan_binogowi.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/74aaa357-9ebf-401b-862e-3a8f36bf2f6e/the_natural_life_mugs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9896d616-5017-4d14-a1ae-5d33a2611eb9/90658147578.pdfIn PDF document text
    • http://jonimixe.rf.gd/tipos_de_angulos_geometria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26fe794b-3dfe-4402-a4af-585248db1042/62799344026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02a77732-5a38-4da1-b01a-7e345493cc09/mecnica_vectorial_para_ingenieros_esttica_10_edicin_espaol.pdfIn PDF document text
    • http://ranuvukeguzekiz.epizy.com/zubuluxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/016e2ae7-9278-4acd-884c-42559236cc26/nolod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/defd0793-5df9-4422-83eb-98eec4fb3ffc/4133203903.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_off0000d85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85F 5376 bytes
SHA-256: 5949b4c87744615480172228e03f79d75f573f941e0e9cf192db9621f29ac73d
font_01_sfnt_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 10612 bytes
SHA-256: d0603ac6bcca916eeb94cdc025b6eb0de27fc9360d55dcca9d637e9f86abc559