Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33197413fe4d1e7…

MALICIOUS

PDF

92.5 KB Created: 2021-03-16 09:46:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 76cd845238eb23831be0e59e703ec2d3 SHA-1: ef433efea22bd4c85daffb1c0614328b4dfe6a47 SHA-256: f33197413fe4d1e7ceb74694011b2f98721dd91127be39af0086ae8a2340d63d
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely exploits vulnerabilities or contains malicious links. The presence of a large number of external links, many hosted on disposable domains, suggests a link farm or SEO manipulation scheme. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct user-facing lure is apparent.

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://xajibur.ru/strik?utm_term=what+is+life+from+a+biblical+perspective PDF link annotation
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/8434318.pdfIn PDF document text
    • https://jufomefafuxujo.weebly.com/uploads/1/3/4/8/134890319/1769076.pdfIn PDF document text
    • http://xebobimifu.22web.org/brightsign_xd233_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/sibamoxa/geicRQO/pilivijotevorekozi.pdfIn PDF document text
    • https://vesanawe.weebly.com/uploads/1/3/4/6/134602832/6404800.pdfIn PDF document text
    • https://cdn.sqhk.co/gegojagakexu/qz6XDhc/happy_birthday_hockey_mom.pdfIn PDF document text
    • http://dawuxapi.iblogger.org/november_2019_blank_calendar_template.pdfIn PDF document text
    • https://cdn.sqhk.co/fowurona/hf9UEic/new_skyscraper_in_dubai.pdfIn PDF document text
    • https://cdn.sqhk.co/norasoketika/1hhKIjd/mopudabudigezitudosuf.pdfIn PDF document text
    • https://cdn.sqhk.co/zobadaxejaz/chihcGe/english_grammar_exercise_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/gebunemif/hbgjL6v/kewaga.pdfIn PDF document text
    • https://cdn.sqhk.co/fakodozug/jdUggia/15515636389.pdfIn PDF document text
    • http://dotapibipemeza.iblogger.org/19788948867.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/aeb3c4dd-4c0c-4ca3-9773-128525ae16f3/so_sad_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e27dcd5-06d7-44f7-a5e5-d9f284387511/67628579853.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/winrar_filehippo_for_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdb5c44e-d225-4a29-96d3-b6a2cd45150f/nevoneluragojus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7641f313-4d77-46bc-bb01-a7cb295735ae/plantronics_wireless_headphones_troubleshooting.pdfIn PDF document text
    • http://bakavifotegenol.epizy.com/ximupatigofeduzimi.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/74218120068.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D1 5468 bytes
SHA-256: ba53e04f6e5be50bd2b18806ae5367f454196d3adfe296751d27cdb993e87e65
font_01_sfnt_off0001244f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244F 11560 bytes
SHA-256: 4f34ef52ec9b90f093549768da24d2247fdaf31e9d4694a405f26252d094bc5d
font_02_sfnt_off00014bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFD 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939