Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b11a7e4f74dbb5e…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 22:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 68f2f7dc18931762d3b2e7e79215acfe SHA-1: 8138251216a2e5bb4ae64ad742af59fc4902d167 SHA-256: 1b11a7e4f74dbb5eb7605e82df7e09f89240e27a2f9a44f17ea440fb56620ecd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically noted as a 'link farm on disposable hosting' and utilizing 'utm_term' redirects, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 https://irlanc.ru/uplcv?utm_term=kristen+wiig+new+movie+2021 PDF link annotation
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/34668077345.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130322ccf038---vanafezamuzofawove.pdfIn PDF document text
    • http://cloverdiamond.com/file/3790719494.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/97175087931.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/27013065534.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/xepexizem.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/jiderejovonezoxokin.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/nedegexajat.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/336856650613b51ec3cdb8.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/pimofexulunobigagob.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/11679383452.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/45002257717.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/rubixezixo.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/9775412831.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/49014940823.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/lavax.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/40866315936.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/48361031315.pdfIn PDF document text
    • http://cissi.it/userfiles/files/53029921630.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/59584818885.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/3910594201.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/14325097964.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://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_off0000db4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 18568 bytes
SHA-256: 1873dd6feb5335700d303a872aad5337f6da654f15850a735ff318e484768c33
font_01_sfnt_off00010b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B4 10680 bytes
SHA-256: fc1be63c9e33b24935083c45bb617c1fa4e2dd60445e242c2d7729ffa843d637

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