Malicious PDF — malware analysis report

Static analysis result for SHA-256 707011a94fc7ba46…

MALICIOUS

PDF

72.8 KB Created: 2021-09-17 10:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8c3fddae31fae42519b2ced6e169be84 SHA-1: b3143f0754f418da7f0e5ce06e96ac41a016f3c1 SHA-256: 707011a94fc7ba466717c08f15e7fb25bf44f2a01526b5313dad75ee175d2693
126 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. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content, while heavily obfuscated, are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 http://hanarotalk.com/userfiles/file///dupitelanelob.pdf In PDF document text
    • https://topinsolventa.ro/userfiles/file/22020356155.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/73201253303.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/64316276711.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/73156335346.pdfIn PDF document text
    • http://www.polni.si/Images/files/20034316968.pdfIn PDF document text
    • http://nincity.de/inline/file/4863461918.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/vixefabejidelidakare.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/79bfe0800f5c317505eb69c053de3446/84913560427.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/jevipulumozitakuxijeguweb.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/fenitufuv.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/74913144522.pdfIn PDF document text
    • https://everestart.com/images/stories/file/41721308114.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/82053805655.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/70083692498.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/93693479151.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/163158352540477bc2adceef4d2c90.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/26391699149.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/943576725.pdfIn PDF document text
    • https://visualarchive.bg/files/50525580358.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109110553444147.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/58260738861.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/4439cafa7497f1bb3d084b11c94221a2/jepozido.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/mowifusabafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=top+10+mp3+download+apps+for+androidPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA44 16472 bytes
SHA-256: 3ca83c3be9f1653242f0e748295628202f95213580da19a3c147d9a5bf628a62
font_01_sfnt_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC60 10824 bytes
SHA-256: a8f4d34e2837e97636b5fa872f851bcc0d8e88d29a36b5a48f21edbc1b824cc9

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