Malicious PDF — malware analysis report

Static analysis result for SHA-256 e637ec138ea25078…

MALICIOUS

PDF

69.3 KB Created: 2021-03-28 08:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95f9e7e0cf367896fbaabceae0536116 SHA-1: 6aa2f781057e020a37ac57476c5c3b2a09776333 SHA-256: e637ec138ea25078a21beb10fe89ea71aa6bc5930b9d73a135fe37706672ef36
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URL pointing to a domain that appears to be part of a phishing lure, disguised as a search result for academic answers. While no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/wix?keyword=apex+spanish+3+semester+2+answers
    • https://static.s123-cdn-static.com/uploads/4393511/normal_5fec0b29421a6.pdf
    • https://cdn-cms.f-static.net/uploads/4378390/normal_604856fbc5823.pdf
    • http://newipufisatag.scienceontheweb.net/hp_photosmart_7525_printer_user_guide.pdf
    • https://static.s123-cdn-static.com/uploads/4412377/normal_5feed6a7d970b.pdf
    • https://cdn-cms.f-static.net/uploads/4407781/normal_604daebe5d824.pdf
    • http://tozidak.mygamesonline.org/jetovamepikopotubuwul.pdf
    • https://cdn-cms.f-static.net/uploads/4368953/normal_6051b73be9201.pdf
    • https://cdn-cms.f-static.net/uploads/4393521/normal_5fdc220baf5d5.pdf
    • http://springwin.space/palijolozatippshuk.pdf
    • http://terakusinuw.mypressonline.com/mathematical_optimization_techniques.pdf
    • http://kmplitka.shop/alien_resurrection_escape_podkfwco.pdf
    • http://trening-ekaterinodar.ru/ccfra_microbiological_methods_manualoaatt.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/e54077ae-b5b1-43e6-93f4-f284c428ac8e/which_bible_concordance_is_best.pdf
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_90d84a2f87164c5ab3a3cb345bb0cc92.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5d2a7afd-2be5-4e18-90d3-ec07e0185a26/81033113753.pdf
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_c89a3576e2574e8a8ec230457d472dce.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7b733076-e864-4122-be19-f0bfc5fb0dae/greek_and_latin_root_words_geo.pdf
    • http://pujumek.myartsonline.com/mireduxem.pdf
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_71dbf1997a874f28ac2984dbc16b292c.pdf?index=true
    • https://b9a4c3d6-4ccf-4d04-9b0f-c2e9c357e15d.filesusr.com/ugd/e5cbe5_1efd4504e59a434cb0bc9076e764e715.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0a57aff3-d6b8-4b94-8e83-7d3eaac561c3/quran_audiobook_english_free_download.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_off0000c6b9.bin
5e67c5404657da53f6399951eb9f6ed4907a34e79dcc7b7ccd4156a4fedbe239		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B9 5148 bytes
font_01_sfnt_off0000d808.bin
a0e4504ecf737beaff6db7196264963db88f6461e754b3f8cfbbc3acc74a4907		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD808 9336 bytes
font_02_sfnt_off0000f7f3.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 4324 bytes

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