Malicious PDF — malware analysis report

Static analysis result for SHA-256 079678b5caf38cec…

MALICIOUS

PDF

81.7 KB Created: 2021-04-06 01:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6fba1099fd005ef7dfdbba7c5adaded2 SHA-1: 19aa323a2c1ca58089740c3c25f78c958e1ee9e5 SHA-256: 079678b5caf38cec8acd6db520f586039eee34095a092817f15c460044b004a8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one prominent URL pointing to 'vilenefex.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates the PDF is designed to host a large number of external links, likely to obscure the malicious destination or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/123?utm_term=transformer+voltage+ratio+meter
    • https://cdn-cms.f-static.net/uploads/4448124/normal_5fd136040d233.pdf
    • https://cdn-cms.f-static.net/uploads/4413226/normal_60239c4b113eb.pdf
    • https://cdn-cms.f-static.net/uploads/4404987/normal_5fd7e4a254cc5.pdf
    • https://cdn.sqhk.co/taxotuzu/hChiMBf/bonikopogenimazatu.pdf
    • https://cdn.sqhk.co/zupodejadofe/fibjdUQ/defender_110_price_new.pdf
    • https://jabakatuni.weebly.com/uploads/1/3/1/0/131071057/zozuwaxosidik.pdf
    • https://bogonifad.weebly.com/uploads/1/3/4/1/134108647/babifebovo.pdf
    • https://cdn.sqhk.co/zafazegig/hZiaP9j/25046013273.pdf
    • https://cdn-cms.f-static.net/uploads/4405930/normal_60297ed626af1.pdf
    • https://cdn.sqhk.co/jabuvilir/uibiija/57187493275.pdf
    • https://cdn.sqhk.co/genizataxom/gigiheT/ludo_club_game_free_download.pdf
    • https://fupopafesuz.weebly.com/uploads/1/3/4/4/134443157/dekoxog.pdf
    • https://cdn-cms.f-static.net/uploads/4470409/normal_5fe93a6b102b5.pdf
    • https://cdn.sqhk.co/zozimevoket/jfaJidS/cake_makers_near_me_prices.pdf
    • https://cdn.sqhk.co/baxoladipezu/jc7pFje/pc_shareit_software_download_windows_10.pdf
    • https://fujelaxu.weebly.com/uploads/1/3/4/7/134704358/delilejanatuli.pdf
    • https://cdn-cms.f-static.net/uploads/4386839/normal_6035f158b9e46.pdf
    • https://cdn.sqhk.co/dawiredi/lNW42uz/fractions_to_decimals_worksheets_grade_7.pdf
    • https://cdn.sqhk.co/wajewukudino/hcAgehf/8997387165.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dec2beda-fa0c-4cd6-8a30-8c6a02066556/dotnet_interview_questions_and_answers_for_3_years_experience.pdf
    • https://uploads.strikinglycdn.com/files/f5a0e088-d29e-4287-b07f-7dab39335b4a/juzenuzisoka.pdf
    • https://uploads.strikinglycdn.com/files/f0e62fb3-a468-4351-afb4-ef64f0e07f9f/56136491182.pdf
    • https://uploads.strikinglycdn.com/files/c7b55c46-235f-4573-aaa2-cbbffa419bb3/27568527294.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebca.bin
4865a1c4475ff349fc365f2353897206d4f7805b0aed941c1f583e9684641c8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 5096 bytes
font_01_sfnt_off0000fd10.bin
19d7a3d14477ef315813d4f70efff85465f39b18de6885c5d08f7f11bcb006bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 10780 bytes
font_02_sfnt_off00012229.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 16164 bytes