Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fe4c8a824aa7074…

MALICIOUS

PDF

72.6 KB Created: 2021-09-20 02:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd80187f867ffde7c58e70f65b92c180 SHA-1: afd6613b6cdbf6f9b53161135e456b8e7c0d9554 SHA-256: 0fe4c8a824aa7074020cdc6dc0e185125a8e3fd5acce65ec015260d421c41489
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to T1059.007, and the overall nature of the file suggests it was delivered as a Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://vico-immobilien.com/ckfinder/userfiles/files/zukogoratonegajokipujozur.pdf In PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/42956417323.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/88555572125.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/18417543184.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16147c16a48896---70558027103.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/ginikunaju.pdfIn PDF document text
    • https://luminex.pl/upload/file/nanovupagatidutitakexub.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210904230524.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/68437931107.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/dejunexapetal.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/4902670759.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/9355709282.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/marixam.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/84394092822.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136afc7bb310---pidavajapamorisiwibixixug.pdfIn PDF document text
    • https://blokhol.com/upload/files/fonijexujij.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/nixekamevaxowewuxetok.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/wuzusojifode.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/72540645423.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/mufuvabikujiviwawuni.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/42445871302.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/fosub.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/nideganadez.pdfIn PDF document text
    • http://nanopena.cz/upload/file/gamoresiripakadara.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/50529143526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=best+ad+free+launcher+for+androidPDF 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_off0000b9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B7 16400 bytes
SHA-256: 4c6d19a7235d58e3798966b4fd002f13447a401961bc8453848a611d75cf5aff
font_01_sfnt_off0000e3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 10724 bytes
SHA-256: c32831ccccd522b82633a509c52c2dbdc35c9ecacac4fa3ec7e4e049b94506fb
font_02_sfnt_off0000fc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1