Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b43d2090e4b76a8…

MALICIOUS

PDF

74.0 KB Created: 2021-03-19 08:36:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ddc97dd02f0a3635528e9ac2f4819f3 SHA-1: b164f031354b8e036ccf6af8f5b19e8ee2521b0b SHA-256: 6b43d2090e4b76a848b29ab0693df0a3ba850127796a99dec642a57a75bf1890
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a large number of external links, many of which are likely part of a link farm designed to improve search engine rankings for malicious content. One prominent URL, 'https://xezojetit.ru/wix?keyword=play+ps2+emulator+apk+2018', appears to be a lure for users searching for specific software, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/wix?keyword=play+ps2+emulator+apk+2018
    • http://hookup756.fun/17276963045n9l1f.pdf
    • https://cdn.sqhk.co/jolodovi/boRqwhb/kumapebupuwulezomurofaki.pdf
    • https://cdn.sqhk.co/rirerujel/dg7Uhd7/umc_hospital_er_phone_number.pdf
    • https://cdn.sqhk.co/ripalufix/aVjchcl/diafragma_dolor_espalda.pdf
    • https://cdn.sqhk.co/kusasuzona/a7hePcu/oxford_business_english_dictionary_online_free.pdf
    • https://cdn.sqhk.co/xivomojuf/aTigNgc/sisters_apparel_sweatpants_price.pdf
    • https://cdn.sqhk.co/xuxiropuwomo/Itjibji/jetegotodor.pdf
    • http://gtmedis.com/cascading_style_sheets_properties_list49vx7.pdf
    • http://bloodcraft.online/nifulobufavibew6675u.pdf
    • https://cdn.sqhk.co/jisogixij/hfhcB8o/jadiregusa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_0d65ad54588e47e8a7cb2ac41ce985c7.pdf?index=true
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_cea6b04feb7b4e06ac6e037468c8a982.pdf?index=true
    • https://s3.amazonaws.com/tikoweravisixu/34913818104.pdf
    • https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_c83af12905d74aa1b419660d5b3fcd64.pdf?index=true
    • https://s3.amazonaws.com/donukadizolin/8381429152.pdf
    • https://uploads.strikinglycdn.com/files/1d1ce54f-1eaf-4e8c-bd77-fb2e60fe1be6/wisitibefomapogul.pdf
    • https://f405dec1-7f90-4f4c-a861-5286f67d0127.filesusr.com/ugd/ab922d_6e9bca8edb5c48f69984287435aaf30b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/386dcb0d-ebf3-44f0-8856-627e3d99184f/98595460233.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_off0000e238.bin
5650ddddf2c0db732bdb8e8000a58971737bbf70a25daa99aae60252c273f678		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 5652 bytes
font_01_sfnt_off0000f56e.bin
ded8997b8bc69d91faf37766b90e9489893bd4b19a5fa02a3d8a1be932f0916a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF56E 11080 bytes

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