Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e3089c1da7ca70…

MALICIOUS

PDF

90.0 KB Created: 2021-04-03 01:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39faf7ce98299685d254e53c147cda88 SHA-1: 94ea0f352991e2570998685b5d5e9b3e018cd358 SHA-256: a8e3089c1da7ca701c97d207bab9698d078155319437a834314dd5f98851580a
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to deliver a secondary payload. The document body, though heavily obfuscated, suggests a lure related to grammar, which is a common tactic for phishing documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=should+ought+to+had+better+grammar+pdf
    • http://kononameve.mywebcommunity.org/future_and_forward_contract.pdf
    • http://degifutuv.scienceontheweb.net/blood_angels_codex_supplement.pdf
    • http://rowefuzoj.mygamesonline.org/rujoj.pdf
    • http://mujododaziwato.scienceontheweb.net/mirivupawumeguboniwoxef.pdf
    • http://tigadugutuvatix.mygamesonline.org/bucket_hat_pattern.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/buganabowumujef/head_and_neck_contouring_guidelines.pdf
    • https://s3.amazonaws.com/nijudow/fuzobififojubefowos.pdf
    • http://vavijirodujozi.rf.gd/70144295431.pdf
    • http://fakuzilezozo.epizy.com/marks_and_spencer_hosiery_size_guide.pdf
    • https://uploads.strikinglycdn.com/files/d5a0b2cc-8ced-4dac-a60b-1cefd9f2929d/80555815783.pdf
    • http://jokubamobivavum.onlinewebshop.net/bevokovonebarabuwun.pdf
    • https://s3.amazonaws.com/varolexexus/live_media_player_apk.pdf
    • http://kevawiposiwa.rf.gd/avery_weigh-tronix_model_640_manual.pdf
    • https://uploads.strikinglycdn.com/files/1a042dc3-b10d-4f3b-b394-bef369c97a47/fuwajakuburisaf.pdf
    • http://zubiluwetij.myartsonline.com/13677866708.pdf
    • https://s3.amazonaws.com/wupuxus/85863226419.pdf
    • https://uploads.strikinglycdn.com/files/5e85e64a-7328-4e3b-9883-4a5abfc22c53/rewidanizebibaxazarisid.pdf
    • http://matemot.epizy.com/baidu_browser_lite_apk.pdf
    • http://zefixufedinokas.epizy.com/chandrayaan_2_information_in_english_2019.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_off00011d66.bin
b2602246187afd403cd8a4cd7d7ff0bbe217bf24dccc1ee85ce667ee0bf95c6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D66 5520 bytes
font_01_sfnt_off00012ffc.bin
90ed71cebfc664881165aaf88632459b34b28622fa7bcae29f4b38c44e522562		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFC 12696 bytes

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