Malicious PDF — malware analysis report

Static analysis result for SHA-256 a776a96b073dc755…

MALICIOUS

PDF

74.1 KB Created: 2021-04-10 12:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 027017568dc21d9df40c0eb1a7503857 SHA-1: 30b8736ac187d3c968b261a3b8bf570db9032dee SHA-256: a776a96b073dc7553343f259f86bc881f5fb84d007920fe7afcf141cddbf240f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits vulnerabilities or contains malicious content. The PDF contains a large number of external links, many pointing to disposable hosting, suggesting it is part of a link farm or SEO spam operation. One of the primary URLs, 'https://fokemale.ru/strik?utm_term=braun+oral+b+triumph+professional+care+toothbrush', appears to be a lure for product-related searches, potentially leading to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=braun+oral+b+triumph+professional+care+toothbrush PDF link annotation
    • https://cdn.sqhk.co/kakapoxavu/jf5ie6a/gelutesibiwetelidur.pdfIn PDF document text
    • http://vimobewawulipiz.mypressonline.com/printable_new_york_subway_map_with_streets.pdfIn PDF document text
    • http://papawugamajube.mygamesonline.org/catalogue_avon_juillet_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/bofimekowadu/eGZgj19/jumafamokatezabowun.pdfIn PDF document text
    • http://xijipeva.mypressonline.com/3996291712.pdfIn PDF document text
    • https://cdn.sqhk.co/lumolixuwo/hoiaaJZ/dental_hygiene_assistant_salary_uk.pdfIn PDF document text
    • http://nemugub.mywebcommunity.org/83466979881.pdfIn PDF document text
    • https://cdn.sqhk.co/datawafag/d5NhrJS/wawosalewesomixudupabilo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7ef7ebf0-bcb0-4ca2-8538-5a19c3e9f01c.filesusr.com/ugd/aff7ca_6d241cf58ccb41f8851fe6320c6c9b4f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f41e9ab9-00a1-4a21-b467-6796d8039bb3/85308485844.pdfIn PDF document text
    • http://zopaxavebalopa.epizy.com/bolsheviks_and_mensheviks.pdfIn PDF document text
    • http://pirokogux.epizy.com/32476168032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3545ba13-662b-42a4-a820-dfa400c28168/gangnam_style_video_song_download_1080p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec016131-8d86-4a6f-8f19-08778c10a324/kowap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64adda7b-79fc-4030-9386-3824fef020cc/how_to_set_up_liftmaster_keypad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7214d289-1403-4d82-adbb-2a5c934240a2/kujodamivulujozuvisilo.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/lights_out_2016_movie_download.pdfIn PDF document text
    • https://38e81cab-313f-462b-917d-d566bf782aa4.filesusr.com/ugd/36aba1_672624f9d2e74b39a31ae4be17b5063b.pdf?index=trueIn PDF document text
    • http://nutogexutal.rf.gd/xivibivorowakerozobanaku.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/92301753410.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/pudabizusovunitagomowiri.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F4 5444 bytes
SHA-256: 2f88f2e5c9239c3b2b33ec6ce7d3e4de9b62fb9352c55dc8cb4c80f1060664b1
font_01_sfnt_off0000fb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4B 10768 bytes
SHA-256: 15e102ea3cdcdea77ae8ecf65d4c10eca17bfdfccf57fbc84e49f4921b7e2be8