Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d620ce05149025…

MALICIOUS

PDF

88.8 KB Created: 2021-03-23 22:28:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ff3cca08986b60b2cbcd88d0d9b41a9 SHA-1: df69cc4507e8f21b62fb2d0053f13e0e65381583 SHA-256: 35d620ce0514902583f5773a5b6105f6f29dc138e780648d4bc8ba7ba0d6d0c1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated or use SEO-like keywords, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/award?keyword=public+finance+pdf+noun
    • http://youralteragoods.com/autocad_mep_2020_tutorial_for_beginnersmk57s.pdf
    • https://jiromozuno.weebly.com/uploads/1/3/5/3/135387519/powosigubinor.pdf
    • https://kimivatebuxokas.weebly.com/uploads/1/3/4/7/134702804/4720544.pdf
    • http://mattelipsticks.site/40153523767sodx5.pdf
    • https://nizedavigo.weebly.com/uploads/1/3/4/8/134879015/derezevan-datumejus-leniguwa.pdf
    • https://peditakufi.weebly.com/uploads/1/3/6/0/136097449/9826382.pdf
    • http://visiblawty.com/nesovoroxam95qm.pdf
    • http://blue-tick-central.com/werinezaduvozanekuxixuvesppdxz.pdf
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/6320874.pdf
    • http://weinmvc.net/kugasu54mxr.pdf
    • https://xipidutaz.weebly.com/uploads/1/3/4/4/134401361/tizezi-gifol-piwumemamene.pdf
    • https://cdn.sqhk.co/xajamenujo/vihgj3b/cowboy_beans_with_smoked_sausage.pdf
    • https://dubebonu.weebly.com/uploads/1/3/0/8/130874554/9248752.pdf
    • https://lawejuja.weebly.com/uploads/1/3/0/7/130740077/2765455.pdf
    • https://cdn.sqhk.co/fogobewataja/hffjgih/17375280800.pdf
    • https://cdn.sqhk.co/figesuweno/Viihjib/silver_dollar_city_christmas_parade_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d981b129-92b0-4327-86a7-87c7d0cb734a/kufipezavakega.pdf
    • https://uploads.strikinglycdn.com/files/df42bc2c-15cb-45b6-bd8a-a49a15241941/to.all.the.boys.ive.loved.before.2018_sinhala_sub.pdf
    • https://uploads.strikinglycdn.com/files/5458697b-b07a-4841-a28d-efa6b3fd8fe1/divoledede.pdf
    • https://uploads.strikinglycdn.com/files/d39b88dd-e3f6-44bd-93a0-bd2e6ef37ef1/android_development_kit_hardware.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d55.bin
26fcb4b75620dfe91852ce28f983b53e10f1e4ebfd3afd2174a454d41eeb96ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D55 5016 bytes
font_01_sfnt_off00012e78.bin
6b429bb417b011fde49a97e18a9d9f2c3a1c21829c2ce52433b03c59bf475c25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E78 11440 bytes

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