Malicious PDF — malware analysis report

Static analysis result for SHA-256 1563492c3c4bfbcf…

MALICIOUS

PDF

132.5 KB Created: 2021-04-07 21:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2a3e463f97bf8a3735d73de50f58e3d SHA-1: 248b0b8f780531b76bf4c7d39dba9d7fc1e147ea SHA-256: 1563492c3c4bfbcf7bc16e59a20ed0d4eaea20fdff941403aefe53515813f874
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to 'maypoin.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to 'chapter 2 geometry answers', indicating a social engineering attempt to trick the user into visiting the malicious URL.

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://maypoin.ru/wix?keyword=chapter+2+geometry+answers
    • https://cdn.sqhk.co/kegimovotol/tB9iheI/19054054332.pdf
    • https://static.s123-cdn-static.com/uploads/4465018/normal_6002ed55b7db6.pdf
    • https://cdn.sqhk.co/jorubili/fieshhf/zoxudabamipopuvurux.pdf
    • http://xunarepozufuz.mygamesonline.org/32789783720.pdf
    • http://fikakutipid.mygamesonline.org/gixarureluwosel.pdf
    • https://cdn-cms.f-static.net/uploads/4373776/normal_604f6bd38fb1d.pdf
    • https://static.s123-cdn-static.com/uploads/4402503/normal_5ffed01eb6e08.pdf
    • http://xumupizaxuto.scienceontheweb.net/25618000690.pdf
    • https://cdn.sqhk.co/wuladupuzo/VB9LijB/63184653216.pdf
    • https://cdn-cms.f-static.net/uploads/4458631/normal_60681ee30ecfc.pdf
    • https://cdn.sqhk.co/tedemibane/C9GhjWT/8466817497.pdf
    • https://cdn-cms.f-static.net/uploads/4388162/normal_605ad920e97fb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_d4ffa1a389c14446b1d6624b74135bf7.pdf?index=true
    • https://s3.amazonaws.com/kukupunopedon/profit_and_loss_sheet_for_rental_property.pdf
    • https://s3.amazonaws.com/tuxexi/idsa_hap_vap_guidelines.pdf
    • https://s3.amazonaws.com/bodajaku/nubupegis.pdf
    • https://2e81f42f-67f9-46a9-89e2-a5f3ab3b03ee.filesusr.com/ugd/f138f5_d1f6369eaf2645c198b800239645bed6.pdf?index=true
    • https://fec450ea-b80f-4746-b851-35139cc02de5.filesusr.com/ugd/53a83b_ad1dd5a5f001480b8743d38302bd4145.pdf?index=true
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_a570b9064390478884a41bc99d15d3f9.pdf?index=true
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_bbb60bfe89bf4ce3a469c2670c44f222.pdf?index=true
    • http://suvalomimo.atwebpages.com/fosudesolatiz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b322.bin
e2a2a88c4806d2bf0282f76bd1eb403ff65d2d26faaeceb829b1219a6fd87aa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B322 5432 bytes
font_01_sfnt_off0001c587.bin
b4ac63d31d1dbfed8e6a3742a89cbb602e08617523deb839c6d0fdef4fc1b4b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C587 12028 bytes
font_02_sfnt_off0001eecd.bin
6169052c0942a2007102a9f4630fb89f27a2697739641009c870a724e0aed6eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EECD 16248 bytes

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