Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d6bdfa1bc1a101…

MALICIOUS

PDF

87.4 KB Created: 2021-09-20 04:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ad1f6b10a1cd8ed8b8d8b5e7aca336f6 SHA-1: 957691d0f5899bce254d43e9d32d1ccc026aa15d SHA-256: 76d6bdfa1bc1a101732ebfef9248b214c2d3dab18a96c8bb1936a8412b47bb23
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=devil+at+my+heels+pdf PDF link annotation
    • http://xn--j1aii.su/userfiles/file/44095699514.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441fbe86fff---79458464025.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/naxalatugoxe.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/82216277784.pdfIn PDF document text
    • http://xhzhengli.com/upload/37439077794.pdfIn PDF document text
    • http://aspit.ro/imagini_ws/sozilumaregifanusisopu.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/vupiri.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-7/20210907022127657053.pdfIn PDF document text
    • http://rafaelokazakov.com/file/42925286901.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/47753980517.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/21942520075.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/lizer.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/jibabubigabe.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/1285786839.pdfIn PDF document text
    • https://davnosti.ru/upload/laluzelutorikizudegog.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/lifavuduniku.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/39069327575.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/kedemoleruvovalawad.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/6647815455.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/49883968047.pdfIn PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/nijama.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/rigotiwipuvubexubaselufi.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/35902733404.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 17688 bytes
SHA-256: bc6eff9377b56570b7c8fdd98ff5ca1f0269734467dbfc5f31152276017125af
font_02_sfnt_off0001210c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210C 10620 bytes
SHA-256: 0ab06a7cb1b08b27d2d83067b970dd5c150916254749e3eac5141d372eeb2a15
font_03_sfnt_off00013960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13960 16416 bytes
SHA-256: 0a7c40006fc27d51153b21d6a48ea79a8c7f146cc8b15030b343ea684e52a4c8

Open this report in the interactive analyzer, or submit your own file for analysis.