Malicious PDF — malware analysis report

Static analysis result for SHA-256 691f7e66b913a18e…

MALICIOUS

PDF

76.2 KB Created: 2021-01-27 16:02:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d741792df05c082d8e2fb9954c3b5d74 SHA-1: e746e04e490c8b7eef4fa695e458016d2684eaf0 SHA-256: 691f7e66b913a18e31799e62bdcdb7ae9a1e63379de7dea02775faf6f50f9b71
206 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://leonvi.ru/123?utm_term=eyewitness+video+fish+worksheet PDF link annotation
    • https://cdn.sqhk.co/rawerusiwala/GVkiiEu/laser_wood_cutter_machine_price_uk.pdfIn PDF document text
    • http://dkmz3.club/quantifying_biodiversity_spider_lab_answer_keywztgd.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/WRHXkKO/word_sweetie_crossword_puzzle_game.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/99024665204xpdbn.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/7hfjagd/pinball_museum_asheville.pdfIn PDF document text
    • https://cdn.sqhk.co/tatiderubota/gcgjeRX/create_a_list_in_excel_sheet.pdfIn PDF document text
    • https://foxevavudutis.weebly.com/uploads/1/3/4/3/134380199/lokadetalerokap.pdfIn PDF document text
    • http://simultaneously.space/kajanusufcgbv.pdfIn PDF document text
    • http://musc-media.xyz/luwize8df10.pdfIn PDF document text
    • https://xedowekogo.weebly.com/uploads/1/3/4/6/134609622/xivavurus_gilofobuk_vafivefa.pdfIn PDF document text
    • https://zuzedunili.weebly.com/uploads/1/3/4/4/134460484/fuguzatu.pdfIn PDF document text
    • https://pasojifet.weebly.com/uploads/1/3/0/7/130776368/2665551.pdfIn PDF document text
    • http://itverys.space/broken_vessels_amazing_grace_sheet_musice4jx7.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/fasudikek/endgame_full_hd_wallpaper.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/dejaxufoserez.pdfIn PDF document text
    • http://raseloxezonavo.epizy.com/toxuzenixipebexi.pdfIn PDF document text
    • http://nulesuli.epizy.com/bangla_english_software.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/vofanenafaravexik.pdfIn PDF document text
    • http://bopuxenuxesozu.rf.gd/online_convert_scanned_to_editable_word.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_off0000ec15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC15 5028 bytes
SHA-256: 417acad374e9d79c2ff16f03a6448fc1dd6848cdd3ff29bbe2f0fa7942c66088
font_01_sfnt_off0000fd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4F 11100 bytes
SHA-256: 8b12ee5f8a995e1118930c669a6bbda7d8932df4bda7dabd2fd1dbeb215e6bc1

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