Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5431b3dedd1be6c…

MALICIOUS

PDF

83.1 KB Created: 2021-02-11 09:56:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9303156f90720921e9f0f033e52dc709 SHA-1: 8b6ea673a9d579d02e0885d98d26d4a3be1559cd SHA-256: f5431b3dedd1be6c497a3c7c9103b684a8fd37dd20b584b4ea436d56cd5b388d
136 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-severity rule indicating invisible links to a suspicious domain. The ML classifier and ClamAV also strongly indicated maliciousness. The document contains embedded URLs that likely serve as lures or direct download locations for further malicious content, such as the PDF found at http://ig-supportcenter.xyz/302088143588lw87.pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://baarspo.ru/wb?keyword=bajrang%20dal%20dj%20song%20%20mr%20jatt PDF link annotation
    • http://ig-supportcenter.xyz/302088143588lw87.pdfIn PDF document text
    • http://axacheat4.xyz/suxefidekuzoxefidasomazikjx52v.pdfIn PDF document text
    • http://subbellassecret.com/49003250590qakkv.pdfIn PDF document text
    • http://outputqwvk.space/wajudogifuwowinoloxejev98in.pdfIn PDF document text
    • http://bet-info.ru/pubg_song_download_mp3hkygg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/converting_area_units_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/64610385874.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/anfibios_e_repteis.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/fufazaxisanijenezaxewa.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/satsuma_street.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/your_daddy_s_calling_you_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/chura_ke_dil_mera_song_pendujatt.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/79413626889.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/clinical_pharmacology_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/buseditedusezirexo.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/30284547920.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/amira-_avizo_software.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43B 4892 bytes
SHA-256: 994c625e7268fe36a4dd9ae437501a7ba615c5a88f3eecc91f3b1eb01656de82
font_01_sfnt_off0000e4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 12128 bytes
SHA-256: 9c7220901b6b97f09b78f7e6230a30652f972202145fa780c40f87ef2fa09d04
font_02_sfnt_off00010af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF3 16172 bytes
SHA-256: 381424728c10bdcd1f9a3a95663dcef28d42386f899953847bba40456226a25c
font_03_sfnt_off0001201b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
font_04_sfnt_off00012e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1A 3816 bytes
SHA-256: 47d78eda6df3931aba8dab2c7112782dd8253fe9013f8b46963b6e57437c005c

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