Malicious PDF — malware analysis report

Static analysis result for SHA-256 947dc3bd8ff2574a…

MALICIOUS

PDF

84.4 KB Created: 2021-09-18 18:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1f21c6f391b1869e7dda26f083af0127 SHA-1: 5850ca1f89df2c4afe5787008d940eda1af11b0b SHA-256: 947dc3bd8ff2574a27db835bf711978ce3e1331e9712c5793488a2cac7d839f4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=repair+firmware+4files PDF link annotation
    • https://network-italia.it/file/40588918192.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/25767599302.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/68744836649.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/venuzi.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/zevederikeliri.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/79735924711.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/duzigalofubik.pdfIn PDF document text
    • http://artospace.com/pics/file/madagijiropurexepapeva.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/479305644.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/41482998629.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/ganiwusom.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/zidufodaroxozinirofuga.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/guwekowofetidetodib.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/63412900931.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/95940403559.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/zoxurufeniralovov.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/70152496097.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/28b83ad9c68423507ee746a4ac59749f/musasibaxasituxefu.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/vosexusuvabezibafep.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/54217267830.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/xivitikobubozobopegapaxi.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/8969283271.pdfIn PDF document text
    • http://uhorder.com/upload/files/10821989221.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_off0000e80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001001f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001F 17204 bytes
SHA-256: 6eb730423f65770466a58844e20a216ea2abd95f3b3a3a5627f9b92a07a8c048
font_02_sfnt_off00012cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD5 10408 bytes
SHA-256: bfc96923574b220caf8fdcf24f7e8745d7e94f207030c9ec838606577c3afbd9

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