Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a236d05f9ef880…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 04:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f6b8c23f1abcc7fc05fb872b4fa32200 SHA-1: 5467b69045cfa8632078e2784b98985ad189490d SHA-256: 16a236d05f9ef880c7c4f04c66d3cdf8467cc28cb5eeed4763046f088e0dd43f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, presenting numerous URLs, many of which are disposable, to potentially trick users into downloading malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM firings reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • 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://alwaysshine.com/fileimage/file/43170411056.pdf In PDF document text
    • http://sheilahancock.net/blogfck/file/buforududepofutozodime.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/fobalikozaj.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/sovabunivagisov.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/mafosuraxado.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/24607793464.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/totewabaletiboruxajilopop.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/6057965c8103cdfdb9f6738d54e00520/72543735506.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/60085501714.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/42160762411.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210912_7D55AD01CBD65090.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/39894735926.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/86887459641.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/kubatutipezu.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/56816437678.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/ligotaxisulaniwafete.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/fogor.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/neribabewax.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/xokoku.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/88513568262.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/wutefikotometo.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/wikojumewulubomow.pdfIn PDF document text
    • https://costarica4d.com/contents/files/4825288104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=screen+stream+mirroring+pro+apk+downloadPDF 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_off0000dd1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1D 11108 bytes
SHA-256: 4c07edf0e6bad69933989513fbe0b6065ffe7004a170dbc684340ff96f6cc9b8
font_01_sfnt_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 18316 bytes
SHA-256: 325faf0bf5888c7d57fec168be1fde887a3eea889eca5ec6e5b216e48d25afbe
font_02_sfnt_off0001271d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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