Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8aa6b9a8630a939…

MALICIOUS

PDF

76.5 KB Created: 2021-05-04 13:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b1d662a921186ee2a2368b004c62114c SHA-1: 2347e887d15b5d29d25fba2f6bb849216a0a4b13 SHA-256: d8aa6b9a8630a939e8d5edf8874d6a4a3e9174c8b2669880dbe57335aee91489
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', suggesting an attempt to drive traffic to malicious or spam sites. The document body, though heavily obfuscated, contains text related to 'Best gmat prep book 2019' and the authoring application 'wkhtmltopdf', indicating a lure to disguise the malicious intent. The presence of multiple external URLs and a high ML classifier score strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://jumiwimov.ru/strik?utm_term=best+gmat+prep+book+2019 PDF link annotation
    • http://idealslimitalia-official.site/gikapamij2a8.pdfIn PDF document text
    • https://cdn.sqhk.co/wedifedaguju/chgyMjc/heretic_gods_rune_recipes.pdfIn PDF document text
    • http://pemeturaw.iblogger.org/wakuru.pdfIn PDF document text
    • https://vagofavom.weebly.com/uploads/1/3/4/4/134486407/demumotukem_mojezeju_xapeso.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/jjianxH/perfect_color_roll_3d_no_ads.pdfIn PDF document text
    • https://cdn.sqhk.co/liripudeb/rjiB3hc/90370992443.pdfIn PDF document text
    • http://guzofegarakad.iblogger.org/personajes_de_la_obra_bodas_de_sangre_de_federico_garca_lorca.pdfIn PDF document text
    • https://cdn.sqhk.co/paxepilekot/hlihDeE/best_service_company_software.pdfIn PDF document text
    • http://aarbuz.space/how_to_change_trans_fluid_2007_dodge_caliberhkxd3.pdfIn PDF document text
    • http://prostotit.site/78841779335og7uv.pdfIn PDF document text
    • https://futiwetag.weebly.com/uploads/1/3/4/3/134367494/7133353.pdfIn PDF document text
    • https://gijejutet.weebly.com/uploads/1/3/5/9/135974865/jefomovodujuse.pdfIn PDF document text
    • https://xasavogo.weebly.com/uploads/1/3/1/8/131856096/sireke_mozowoxorunen_zesafanavutu_rosuvibaj.pdfIn PDF document text
    • http://cashfree.store/do_you_get_paid_for_instagram_livetpfne.pdfIn PDF document text
    • http://juzupujexeta.22web.org/the_physiology_of_taste_brillat_savarin.pdfIn PDF document text
    • http://daating19.site/kegidimifosu9ewnf.pdfIn PDF document text
    • https://sagetiruguw.weebly.com/uploads/1/3/0/8/130814856/a906e862ce885bc.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/tonemakopinibem/why_does_my_dvd_not_have_sound.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/42712697113.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/fususafam.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/android_10_app_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/35653083473.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/what_does_classification_of_word_mean_christmas.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/behavior_tracking_chart.pdfIn PDF document text
    • http://waxedejav.epizy.com/class_12_cbse_sociology.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_off0000eca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA9 5844 bytes
SHA-256: a86e14bb71a453f6f84e52026b44eb051ea87bdafb3d70159533fd38b0a0ea66
font_01_sfnt_off00010077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10077 10680 bytes
SHA-256: af4f8a4b2a05b1f7ccd0a1ed321c93048869d779162441ea09e9f86cc99a006d

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