Malicious PDF — malware analysis report

Static analysis result for SHA-256 8764930a5ee17f69…

MALICIOUS

PDF

78.0 KB Created: 2021-03-15 21:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b9a703b54887e5837e6a2b6d81242c9 SHA-1: d7b5fd593d03a0d88fa4f3bcc2dd8a254312f72e SHA-256: 8764930a5ee17f69c72961504e9267d0f99acf8bff312fec9e59c29bd1a4cd8e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm designed to distribute SEO-poisoned PDFs. One of the primary external URIs, 'https://mezovuduw.ru/wix?keyword=cell+defense+the+plasma+membrane+worksheet+answer+key+free', suggests a lure related to educational content to entice users to click. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/wix?keyword=cell+defense+the+plasma+membrane+worksheet+answer+key+free
    • https://xamoguxa.weebly.com/uploads/1/3/0/8/130874300/5800879.pdf
    • http://spindlndou.space/zonopozewotowaku8bmea.pdf
    • http://nuxuzuruguli.mypressonline.com/fender_mustang_gtx100_digital_modeling_combo_amplifier.pdf
    • http://belkwigs.com/fodmap_liste_aliments_autoriss0ihwn.pdf
    • https://niritopep.weebly.com/uploads/1/3/4/6/134634222/2560327.pdf
    • http://vipadobotisituz.mygamesonline.org/wenoputelepunuremugu.pdf
    • https://mebijanuwirat.weebly.com/uploads/1/3/4/0/134042853/maxovanafajafuj-xediviwosereki-jogakiv-wemukukovejer.pdf
    • https://gitijekukojijot.weebly.com/uploads/1/3/4/6/134626905/waporamawekido.pdf
    • http://rowowevu.mypressonline.com/numemomoxovob.pdf
    • http://kernig.pro/wukagodexabekoferebomuziwqlax4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fumiposamisur/zasajedunidilumob.pdf
    • https://uploads.strikinglycdn.com/files/27a2f827-bb33-4247-9837-05bda73f365c/52771797664.pdf
    • https://uploads.strikinglycdn.com/files/94ca55f8-a2d2-4154-869d-38905d24ae87/what_defines_a_viking.pdf
    • https://uploads.strikinglycdn.com/files/ce134566-b2b6-4616-b293-c58dff7a7134/what_is_the_rarest_skin_condition.pdf
    • https://s3.amazonaws.com/wizakokowe/america_english_video.pdf
    • http://fugufaza.myartsonline.com/2012_ashrae_handbook_hvac_systems_and_equipment.pdf
    • https://uploads.strikinglycdn.com/files/fac9b41c-7430-4d95-8eae-5183b305cff1/22182168936.pdf
    • https://s3.amazonaws.com/numegubowalonan/angle_between_two_lines_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/a568125f-3c30-411d-a30c-ee76a9e32e7b/rimug.pdf
    • https://s3.amazonaws.com/bomupi/skyrim_sheet_music_trombone_solo.pdf
    • https://s3.amazonaws.com/wivunonovef/guwukajogukagom.pdf
    • https://uploads.strikinglycdn.com/files/fb0a1b4b-3ec1-43e5-866e-ef85201e2169/harman_kardon_onyx_mini_user_manual.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e590.bin
ad32e64c888fd7bcf3207db257104346cd4caf9876545885bab72edc725a5c4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE590 5444 bytes
font_01_sfnt_off0000f7ed.bin
b78d08bb05237823ee1464b88856b97be7b18cf7d97cec3e00b019414b15960b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 10636 bytes
font_02_sfnt_off00011c2c.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2C 4324 bytes