Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1a962efbfab651…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 15:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9bf974cb697ce0ec6dd2b757677bca6b SHA-1: c7edd15a1a6e6193ee8cc0442dc04fa13bc331e6 SHA-256: cc1a962efbfab651d09fa05d9909b15ee8799de96c31e8cff4d83ee829274a72
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URIs point towards an attempt to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://synerhu.ru/uplcv?utm_term=android+app+sites+free PDF link annotation
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/75230693934.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109011017411375.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/tunilamavolatakagulopeg.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/lixatimabefapanasita.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6135f30893e30.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/mutodixibomuzapitadefunix.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/45855083761.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///zufewajejewovofewagisu.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/63318387323.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/kujujogimul.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/belivokurinovebewe.pdfIn PDF document text
    • http://inistor.com/ufiles/files/43500939412.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/27445193550.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/66139437257.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/88903556801.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/kedupopovubufividiziva.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/tebuvupadufutu.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/pidijovatopugatotufetar.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/mepawudefuneto.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/rizumezokobidifonotaxap.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/guvuposofagobikuzuz.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16136cc08b55c1---36096983860.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/75210314237.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_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 17692 bytes
SHA-256: c92efa694d6c7d4f2390b03313358b460e105c43d618cd35a4f44dfc84645637
font_02_sfnt_off00011f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F37 10428 bytes
SHA-256: 5e3cdc52cd89108d83cd5d63b861efe43312ac7db8709ea2698e254dd64e7472

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