Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f3e7899fefa5277…

MALICIOUS

PDF

76.4 KB Created: 2021-05-20 00:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 07bf8399314dbb444640828267be4f96 SHA-1: 2c5cbd763ce3d85f367fd22b4f3f97d68ac1ed04 SHA-256: 9f3e7899fefa527713afeb2d60e7c62122eb6cda46cfae3308775b98da05925f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and one prominent link disguised as a download for 'docker desktop for windows 7 32 bit'. This indicates a phishing or scam attempt to trick users into downloading potentially malicious software. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

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://baarspo.ru/strik?utm_term=download+docker+desktop+for+windows+7+32+bit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390074/normal_600bcc3cefc5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465012/normal_5ffbc8516cb0a.pdfIn PDF document text
    • https://vamarimorojikav.weebly.com/uploads/1/3/4/6/134640123/dabirugivuzon_jumotikegulaj_setesowiniwozek_bofifodinakovip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409814/normal_602a1b1d8ded5.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/norovefes.pdfIn PDF document text
    • https://zulatikuwa.weebly.com/uploads/1/3/0/7/130776211/fe0e02c89b00.pdfIn PDF document text
    • https://nuliludozaremul.weebly.com/uploads/1/3/4/8/134887499/xusuzekala.pdfIn PDF document text
    • https://jafobapobeloret.weebly.com/uploads/1/3/4/0/134017135/kusaj_lasosejosi_kezuninususemum.pdfIn PDF document text
    • https://tavulejitozusol.weebly.com/uploads/1/3/0/8/130873759/8286400.pdfIn PDF document text
    • https://ganipomadajo.weebly.com/uploads/1/3/2/6/132695424/8906686.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/ed570c71-1a98-4489-9f0b-5b6e813e18a2/linking_words_list_english_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfacb456-5c49-4162-bc5f-9a9328219e3a/culture_means_of_production.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a57783d6-dd75-4163-b378-997bc8e6fa15/how_much_does_mercedes_maintenance_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/toshiba_television_remote_control_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbba1646-85f9-4012-b89b-282e667b4a1d/94381603465.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/pametuvivukovepukosufom.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/what_is_honda_service_code_b12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14114f37-fd71-4055-9eb3-e7179e6f6041/21369715803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a902b49-e5ce-453b-97fd-94e593608e25/56227354132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865206b8-bfe3-40a0-94ec-d620f56fa484/15373129004.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_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 5820 bytes
SHA-256: 42c029aa7f67a20ae8ddcc0c9676a7884234c28b8e230642756ca13e84f7cda4
font_01_sfnt_off00010093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 10448 bytes
SHA-256: 680e4db89d0df62cdd3a4cfe605411860b66db33c57aba18f41bf73f182b815a