Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b7e11a71fdf9eae…

MALICIOUS

PDF

105.9 KB Created: 2021-04-02 16:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72ae633ff4e23436bd6bc6f0b663b6a5 SHA-1: 4994805f1916a35cf256c72613d6d97891bc4f4f SHA-256: 1b7e11a71fdf9eaea5f938873866ea495f9e76a44515740e44b6e3a41753637c
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains keywords related to textbook solutions, suggesting a lure to trick users into clicking the malicious link. ClamAV and ML classifiers also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://zajinet.ru/award?keyword=calculus+with+applications+10th+edition+solutions+manual+pdf
    • http://tojubilabesi.22web.org/lifixubagebi.pdf
    • https://cdn-cms.f-static.net/uploads/4479916/normal_604b2cfc5a5d9.pdf
    • https://cdn.sqhk.co/jagibuvat/MjiPBmE/nizoxipe.pdf
    • https://cdn-cms.f-static.net/uploads/4490127/normal_60118803057d3.pdf
    • https://static.s123-cdn-static.com/uploads/4384639/normal_5fef0d28e4852.pdf
    • https://cdn.sqhk.co/zapajugadira/flSWynh/microsoft_azure_fundamentals.pdf
    • https://cdn-cms.f-static.net/uploads/4460255/normal_605f7a3e86ada.pdf
    • https://cdn.sqhk.co/fotinegataso/ghibidV/kazatuda.pdf
    • https://static.s123-cdn-static.com/uploads/4384828/normal_5ff1494730482.pdf
    • http://buvepanakupa.22web.org/autosuggestion_buch.pdf
    • https://cdn-cms.f-static.net/uploads/4366036/normal_604b3bcfdd7eb.pdf
    • https://cdn.sqhk.co/nawamuzimosu/QsTr3je/sulesuzoregijagupiga.pdf
    • https://cdn-cms.f-static.net/uploads/4401525/normal_5fe941f172c3a.pdf
    • http://tijoxuxiga.iblogger.org/microsoft_excel_vba_programming_for_dummies.pdf
    • https://cdn-cms.f-static.net/uploads/4488317/normal_60326100daba7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_913365c7a2ab4a7f85d9a5791b847288.pdf?index=true
    • https://s3.amazonaws.com/rezugekolaba/factoring_linear_expressions_worksheet_7th_grade.pdf
    • https://s3.amazonaws.com/woberiz/animal_farm_moses_quotes_quizlet.pdf
    • https://36535336-4f9e-4c0a-b1ad-3385cb5d4299.filesusr.com/ugd/15ebe2_e2924bbf9a4c4bdbb95f943ffb01bf52.pdf?index=true
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_f05afeb4c540417eadb75978386f7532.pdf?index=true
    • https://s3.amazonaws.com/muvemasoxaji/vavoluwuzilegezil.pdf
    • https://s3.amazonaws.com/robumuduluwise/ganobafalexumaba.pdf
    • http://fexonawu.epizy.com/kenmore_elite_washer_will_not_drain_or_spin.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001371f.bin
689ceee6f7fd132ee93cea45745047d22971e6ff94cab14ddccb1572e1936864		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1371F 5488 bytes
font_01_sfnt_off000149b8.bin
795c5c5a1e01e54cc8052fff0d09a887ba6396f2ba77ebfa0c2dcfe61b5118e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149B8 13616 bytes
font_02_sfnt_off00017470.bin
ae97ebdbf5cb6679ee3ae7f6f8963da9ec2437ada1f672a33085bc8cbe806833		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17470 16060 bytes
font_03_sfnt_off00018904.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18904 4324 bytes

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