Malicious PDF — malware analysis report

Static analysis result for SHA-256 be43f5aaa3576e31…

MALICIOUS

PDF

88.2 KB Created: 2021-05-04 09:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 4162475f35a0875f48880f9c503be1f0 SHA-1: 59b53fb9080b2658968c7bbbff15209f8d562f48 SHA-256: be43f5aaa3576e3182c2c34f10a1e74571c1c75c664278b67bd39c067cce3c81
166 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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://golowaki.ru/strik?utm_term=finding+derivative+with+fundamental+theorem+of+calculus+khan+academy PDF link annotation
    • https://dixelopenam.weebly.com/uploads/1/3/4/5/134590152/1929880.pdfIn PDF document text
    • https://kinumefiboposif.weebly.com/uploads/1/3/4/8/134865532/4453053.pdfIn PDF document text
    • http://biweekamnf.com/jogujinitulej9qcuu.pdfIn PDF document text
    • http://fijigud.22web.org/an_inspector_calls_notes.pdfIn PDF document text
    • http://fartook.online/angkor_and_the_khmer_civilizationsj47m.pdfIn PDF document text
    • https://danexuxubusam.weebly.com/uploads/1/3/2/6/132695747/153c3a8f.pdfIn PDF document text
    • http://graatorama.space/shogun_near_me_phone_number4n7yx.pdfIn PDF document text
    • http://istra-backwater.ru/ksp_wheels_mod10g2f.pdfIn PDF document text
    • https://sovuzozasofebod.weebly.com/uploads/1/3/4/3/134343281/ee0b7a64be149b.pdfIn PDF document text
    • http://goodxday.xyz/gali_chirugali_dj_song_telugu9msco.pdfIn PDF document text
    • http://zefutuwukeras.getenjoyment.net/77657740947.pdfIn PDF document text
    • http://sagunutu.medianewsonline.com/reading_level_to_lexile_level_conversion_chart.pdfIn PDF document text
    • http://vidclips.design/power_book_ii_ghost_episode_7_previewocqp8.pdfIn PDF document text
    • https://xoropugu.weebly.com/uploads/1/3/4/7/134707238/c40d9d40506.pdfIn PDF document text
    • http://classkaod.ru/xbox_remote_volume_not_workingl4nvf.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/14284047910.pdfIn PDF document text
    • http://idealicaitalia-official.site/how_many_calories_are_in_a_firehouse_turkey_sub7rsbn.pdfIn PDF document text
    • http://barashik.space/kazemipomilokuziza7earq.pdfIn PDF document text
    • https://fanizoliboligom.weebly.com/uploads/1/3/1/0/131070566/tupotufijijedefireza.pdfIn PDF document text
    • https://vizodejow.weebly.com/uploads/1/3/4/3/134356937/pezuso_kuruvez_gafozupobu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vejosekafabij.rf.gd/22300766582.pdfIn PDF document text
    • http://vigexosav.myartsonline.com/fipaseravobemabaruna.pdfIn PDF document text
    • http://nibedob.rf.gd/benim_hocam_geometri.pdfIn PDF document text
    • http://fexotupakel.rf.gd/fulidisepulitabataf.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_off0000fe1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 5708 bytes
SHA-256: 71b856c2bd8af3cb1cb8400e6249554e4252e576a5e192444dcd5cbee7c59fc5
font_01_sfnt_off00011188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11188 12928 bytes
SHA-256: cd5d3cfcd10bd159f22f7e14ff319aad3936029b2372c682cd793f6b51eeeac2
font_02_sfnt_off00013cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD6 16204 bytes
SHA-256: 3a4df7b8a1a85330c7b14209b99b453ec2134c5c23e20ab5c55e139988c81a72