Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf12e5a737553fb…

MALICIOUS

PDF

81.4 KB Created: 2021-03-22 23:24:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dda96c7f943bdef86bd9bfe7d76cb5ba SHA-1: 2732c615b80f26cfc6a23ba1047ebf529300c2df SHA-256: dcf12e5a737553fbe0986515eb09965a6d5a0a3ff63f8b8b58d5df7b00de1661
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. The 'SE_CLICKFIX' heuristic indicates a social engineering attack, instructing the user to press Win+R or paste a command, which is a common technique to bypass macro restrictions and execute arbitrary code. The embedded URL `https://maypoin.ru/wix?keyword=nox+app+player+apk+for+pc` likely serves as a lure or a download source for a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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=nox+app+player+apk+for+pc
    • http://volalagokiva.sportsontheweb.net/microsoft_office_access_2007_tutorial_bangla.pdf
    • http://nubuxeki.scienceontheweb.net/learning_management_system_journal.pdf
    • http://joxezorov.mywebcommunity.org/exercise_on_subject_verb_agreement_for_class_4.pdf
    • http://bosuxezaxad.mypressonline.com/al_arabiya_bayna_yadayk_tome_2.pdf
    • http://gakagebir.mypressonline.com/anatomy_and_physiology_colouring_book_for_nurses.pdf
    • http://jedomagisuw.getenjoyment.net/are_oil_filled_space_heaters_energy_efficient.pdf
    • http://gitikirazidapi.medianewsonline.com/62381125339.pdf
    • http://gapagal.mywebcommunity.org/tarosutanejijexasabaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bakoloj/where_can_i_purchase_a_metal_detector.pdf
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_cbf48473403147fabc0a7f654778b653.pdf?index=true
    • https://uploads.strikinglycdn.com/files/48214fd1-3127-44d9-90bd-42d1d5b59c7c/hp_officejet_h470_error_printing.pdf
    • https://uploads.strikinglycdn.com/files/0118a3c4-890c-4d66-bd20-f275a2be7ca6/sodofixisoto.pdf
    • http://sakikuzugodo.rf.gd/8613993779.pdf
    • https://uploads.strikinglycdn.com/files/47f6318f-98d2-424b-811b-860a5480e2e1/65744365102.pdf
    • https://s3.amazonaws.com/jonora/43002059506.pdf
    • https://uploads.strikinglycdn.com/files/559c49ba-c43e-4869-9ae6-654c6a66da85/ginaniwivubalaw.pdf
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_e3b5eace0e3f48e79470dbcae53d6f30.pdf?index=true
    • http://vujapoguxesak.myartsonline.com/nenozonireferozedonanewi.pdf
    • https://s3.amazonaws.com/zexozavo/84943885702.pdf
    • http://lifapalifarivug.rf.gd/how_to_calculate_the_dividends_per_share.pdf
    • https://s3.amazonaws.com/falufusu/nelisezezikul.pdf
    • https://uploads.strikinglycdn.com/files/5afc2ac0-3c0f-43f7-b678-7e6efde88370/yardman_riding_mower_battery.pdf
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_1b0a7317fa55411cb5236bd9c80e59e6.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_off0000f578.bin
2a012440e37c38c1217bbeab6bcd7d4e0ff94d2a80cd843f569fcf5cabd1db90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 5032 bytes
font_01_sfnt_off000106c2.bin
22059a874fd892bc2e9db19e649928354f7e625399123c14c8aa9b3a31d4da9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 21824 bytes

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