Malicious PDF — malware analysis report

Static analysis result for SHA-256 0143217a43f71a35…

MALICIOUS

PDF

69.4 KB Created: 2021-05-11 04:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: de6067c7e96554483e6df4de0eb0c8b3 SHA-1: e8b01ec61bdcfd696520d26f67f4db1e46ebf1a7 SHA-256: 0143217a43f71a353faad2292e874eb726837ef6f378da902a94d6e1f269b346
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates an attempt to manipulate search engine results or redirect users to malicious content. While no scripts were explicitly extracted, the nature of the PDF and its link farm suggest it may exploit PDF vulnerabilities or serve as a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=dymo+letratag+message+erreur+tape+jam PDF link annotation
    • http://xaredazisom.mywebcommunity.org/5668021028.pdfIn PDF document text
    • https://cdn.sqhk.co/mumaxifup/6gjjhBF/peter_pan_e_wendy_italiano.pdfIn PDF document text
    • https://cdn.sqhk.co/zapoboveje/dCjfiam/likee_app_download_and_install.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/hgckue3/abstract_algebra_books_free.pdfIn PDF document text
    • http://kuliwegi.sportsontheweb.net/how_to_make_my_epson_printer_print_black_only.pdfIn PDF document text
    • https://cdn.sqhk.co/kosaboze/iehhIgc/vomiting_in_pregnancy_treatment_nice_guidelines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/najubu/48860169131.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/how_many_days_annual_leave_do_nhs_nurses_get.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_d51981e584ea41c39a9b793dcdef5fe6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/85ce3868-2993-4a6a-a340-bfe7d20a7552/48797002608.pdfIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_5db9a0590af04402ad98d3a25029f19c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/aed8cda0-a995-4bd6-899c-9d04caeac8ab/94085123748.pdfIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_e7554947642b41b0bef329bd964f0d0d.pdf?index=trueIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_8c330afd86494f1498580844ff7d8c3b.pdf?index=trueIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_f42243ec7afc48caad62cf408d26780f.pdf?index=trueIn PDF document text
    • http://radiviwix.onlinewebshop.net/state_corporations_act_kenya.pdfIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_bb884e949b9f423d8585aaf5d47b3ad4.pdf?index=trueIn 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_off0000d1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A5 5316 bytes
SHA-256: 0a254c30c685a5a0e56fd1914583c6da0dd3f0362fa367a9f9b634af21dc9237
font_01_sfnt_off0000e3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BA 10748 bytes
SHA-256: 9a0c47ccc709303427ab02b454c4a04923accd97a9d93bb64833d5ee4b28f1b0