Malicious PDF — malware analysis report

Static analysis result for SHA-256 f441ba941c055d60…

MALICIOUS

PDF

73.4 KB Created: 2021-09-20 16:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c5e37946b649905d62c20fc635916e41 SHA-1: 31706f635a38e146e20e63416f89b45a51d7af8a SHA-256: f441ba941c055d60f5ea589817588aa75e1dbdaf6c1418f7ac5cbd844613f78c
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, with one specifically disguised as a tool to remove PDF passwords, which is a common social engineering lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security filters. While no scripts were explicitly extracted, the presence of external links and the nature of the lure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crysiq.ru/uplcv?utm_term=remove+password+from+pdf+software PDF link annotation
    • https://dangeloremodeling.com/nbloom/fckuploads/file/navamuxito.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/zidiradelarepebop.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/lugojate.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/83383623620.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea01f8516c---jojiwilolonegodiwamub.pdfIn PDF document text
    • http://cataga.de/beta/files/file/78646073961.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/34774633802.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/91370830992.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/16305946796.pdfIn PDF document text
    • https://12shio4.com/contents/files/80338118143.pdfIn PDF document text
    • https://ms01bet.net/contents/files/41822939207.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/jiwudajaxamuzajewaba.pdfIn PDF document text
    • http://sissonne.hu/editor_up/38949490331.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2845b4a1---8913273645.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xapamak.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/depof.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/120026739161378b0cc288f.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/74612324737.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/sepumibajakudota.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/46774834907.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/kisozapur.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/12557427154.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/62867911982.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/jqk1br9svck7fefrmiqnp89bqr/sewizufez.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/vatup.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/wiburofonepegugokoju.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://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_off0000bd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AD 16396 bytes
SHA-256: 5e253c01d79c9e4b403bbbce3acd9a6b6da811ff8a000721db58fdd8eb74dc27
font_02_sfnt_off0000ff68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF68 10612 bytes
SHA-256: afeedd674bcaa71e2be762fa3d7667d3f8e606de7a2868a092029892c6edd06f

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