Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5b87e3aa87a06f…

MALICIOUS

PDF

74.7 KB Created: 2021-05-06 19:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c20f65ab24e24213e080aecccc4ed90 SHA-1: 6995d27fab68cf0f2cdb7995c0c87f462750cef7 SHA-256: db5b87e3aa87a06f75df54dafeb4ef7f425dcce34871ec36d1e2b1a2210a386d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The embedded URLs suggest a phishing or credential harvesting attempt, disguised as an educational worksheet. No scripts were extracted, limiting the analysis of specific execution behaviors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://alihuata.com/userfiles/file/98046351453.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083400c7da27---32023674975.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c240d68ea7---jefuzasupazadogisani.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6ac4fbe12bc059fd72682a60e70802be/darijodozamagosu.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/4ee8e91b90bcabd6c62fad2744829481/45381304892.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/770ebd9f3136824395cf6a0b8cb27b9f/witizunutakitez.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093e70a9a61f---vopadesej.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074422c7517f---35127490013.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/1caeaceb337bfb604ad905317e24c4ce/separikegopofagaxobolix.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f3c10281---kefitakilijoweruk.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/9044f9d2c2dec52a6b2d08b96d381058/42436183393.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/83d7f7a92ca4ce692cf949a85719bd41/86170822086.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/70f9715121e22269d315c7425f6dbd65/15382525875.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087f71f509dc---zukatonuwurexuke.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778d1a84833---tudidirerujanekak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=animal+and+plant+cell+worksheet+middle+school
    • 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_off0000db4a.bin
dd800e7e4668b76bed31a1166f8a9814bca49734bf955bb0db6be5c8a97e3b5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 5244 bytes
font_01_sfnt_off0000ecea.bin
ed3661c45d336d9d91922267d6d9cbfe4c6be631722a0899ed08d362476a167b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 10368 bytes
font_02_sfnt_off0001101f.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1101F 4324 bytes

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