Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a532ec5e385a824…

MALICIOUS

PDF

76.5 KB Created: 2021-03-19 12:55:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff3e54f7cb248e36547a2799a04314b6 SHA-1: 1b3673e83806064549655acb22ce06f6d756566b SHA-256: 8a532ec5e385a824a6433de6ad4f05239c353a96a4c09540a572f4d638b6ec9d
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, suggests a lure related to a 'personal character reference letter'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://jumiwimov.ru/award?keyword=personal+character+reference+letter+pdf
    • https://cdn-cms.f-static.net/uploads/4489412/normal_6010d3f1db96b.pdf
    • https://cdn.sqhk.co/suxavawudomo/VjbXiea/wiwiwi.pdf
    • https://cdn-cms.f-static.net/uploads/4476939/normal_5fe8740b4a402.pdf
    • https://cdn.sqhk.co/dujagazatad/cgjhhja/31992892626.pdf
    • http://bolipoloweda.mygamesonline.org/exogenous_pigments.pdf
    • https://cdn-cms.f-static.net/uploads/4369189/normal_5fd94976a5ece.pdf
    • https://cdn-cms.f-static.net/uploads/4453142/normal_601166b237ded.pdf
    • https://cdn.sqhk.co/tipadasa/eijJjfz/zawefazogisamasibebisegu.pdf
    • https://cdn.sqhk.co/vegedusovo/iiagc7N/melubegegakerurekajokusob.pdf
    • https://cdn-cms.f-static.net/uploads/4471481/normal_6025030a20401.pdf
    • https://cdn.sqhk.co/feketukadoz/if2igcX/cytus_alpha_switch_physical.pdf
    • https://cdn-cms.f-static.net/uploads/4463277/normal_6042f8320ae6c.pdf
    • http://rusewigojubilon.mygamesonline.org/luluvawodijisak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vumovofun.onlinewebshop.net/ncert_physics_textbook_class_11_part_1.pdf
    • http://rukosivujuxu.atwebpages.com/club_car_precedent_accessories_amazon.pdf
    • http://pilejifizodan.onlinewebshop.net/facts_about_germany_download.pdf
    • http://movuzawizigevej.myartsonline.com/sovizuvateduzozewuba.pdf
    • https://uploads.strikinglycdn.com/files/6bf1c448-50aa-4620-8493-37b34983a21e/xulubepurijugeviselapogu.pdf
    • http://kuzemepusiloj.onlinewebshop.net/15672084055.pdf
    • https://uploads.strikinglycdn.com/files/b8f28bd6-97a3-402f-84c0-cba5318d009a/old_snapper_riding_mowers_for_sale_near_me.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecbd.bin
66666c63e6b36b88c2f753cf9d243c9b5afb8bcaacaad196dd8cee50742aa151
pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 5244 bytes
font_01_sfnt_off0000fe8c.bin
80c7cf5c3640b8674d6816b591edc750b5e4fabd6fa543533b2a338b90a13391
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8C 10724 bytes