Malicious PDF — malware analysis report

Static analysis result for SHA-256 41505e1c8389f1d6…

MALICIOUS

PDF

88.6 KB Created: 2021-03-31 12:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6a5309e212e7640bf8b3361321751e1 SHA-1: 07fd39b4a88d92ffa7f1ae93da8b2cc6debd71c1 SHA-256: 41505e1c8389f1d63f60532a5495757af0f92e8ed87bb6cea20a1398ba5360a6
96 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating the presence of external URIs and embedded URLs, with one primary URL identified as malicious. The document body, though partially corrupted, suggests a lure related to 'Pearson spanish lab answers' to entice users to click the malicious link. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dafemum.ru/wix?keyword=pearson+spanish+lab+answers
    • http://bettyloustintruckbbq.com/samuel_beckett_quotes_waiting_for_godotvq6he.pdf
    • http://kernig.online/pure_cash_free_cash_rewards_apkg26ci.pdf
    • https://cdn-cms.f-static.net/uploads/4366369/normal_6042c9e317606.pdf
    • https://juruditusevowe.weebly.com/uploads/1/3/5/3/135329261/6164354.pdf
    • https://cdn-cms.f-static.net/uploads/4412588/normal_5fd7d2c66d8e9.pdf
    • https://misadedami.weebly.com/uploads/1/3/3/9/133997414/670d55.pdf
    • http://itwow.info/13195056267ojrob.pdf
    • https://sixixufur.weebly.com/uploads/1/3/2/3/132303163/lafupejeme.pdf
    • https://static.s123-cdn-static.com/uploads/4458394/normal_6003fbdd99aa5.pdf
    • https://cdn-cms.f-static.net/uploads/4484370/normal_60198b9256789.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_a8300529c556445e8aaa9985669c637c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/633e7374-8c20-4cae-ad6f-9a9ffc71a3c9/81881706663.pdf
    • https://s3.amazonaws.com/wexukufedepim/latex_algorithmic_package.pdf
    • https://uploads.strikinglycdn.com/files/5e6aabee-ee29-471e-8dcb-85156807a0b5/fuxewogazunebadepetodiv.pdf
    • https://s3.amazonaws.com/bipovoromoj/70233308162.pdf
    • https://uploads.strikinglycdn.com/files/8517c271-0536-4bfc-9cae-457252ecef5a/why_use_text_features.pdf
    • https://uploads.strikinglycdn.com/files/91995af1-c30f-48df-9503-955d86a33b0c/83060673906.pdf
    • https://s3.amazonaws.com/sefukirexuwekij/pupawapexarateluko.pdf
    • https://uploads.strikinglycdn.com/files/409099c8-5340-4836-ba8e-07a7d885d531/die_unendliche_geschichte_hrbuch_spotify.pdf
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_e5f33890bd1e43f68cac5978b7bea896.pdf?index=true
    • https://s3.amazonaws.com/gajabedafot/gonevugomovopunoba.pdf
    • https://s3.amazonaws.com/bulolimepol/isaiah_berlin_historical_inevitability.pdf
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_6e8b4ff53ce9462897d7d1bb2bb1c75c.pdf?index=true
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_9989250bb60f47e592caf415ae068819.pdf?index=true
    • 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_off00011f14.bin
1774f3c01e703731094fc365ea64584665a2c74ee9d4b98179f38663ad6b50ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F14 5140 bytes
font_01_sfnt_off00013096.bin
975b41d3e25289afda40aef160467d63a429b0a1eca54425aa2eeb3dd0c15264		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13096 10728 bytes

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