Malicious PDF — malware analysis report

Static analysis result for SHA-256 4021c0f45d886139…

MALICIOUS

PDF

68.8 KB Created: 2021-09-20 08:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6424713f6cafd6a766bf9f0b5f3ab5a5 SHA-1: 964e1a6d3eb3164b72f12913ff5371297d8c6a60 SHA-256: 4021c0f45d886139c4aefdb3c09b81d1de5921c449312a1a119a7407e582f4c2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://catamma.ru/uplcv?utm_term=find+the+square+root+of+7 PDF link annotation
    • https://klcconsulting.eu/klc/file/20297554730.pdfIn PDF document text
    • http://schokozentrale.de/idata/bigomuwupagiwa.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/bemekofafuf.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/ruwonugizoma.pdfIn PDF document text
    • https://quasar.mago.ro/ckfinder/userfiles/files/dofusanagirawe.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/sadewuwokox.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/81131044907.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/vefubupubagulakatofikota.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/negotinivojiwovarozafe.pdfIn PDF document text
    • https://dafelia.com/files/26153158954.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/72536721363.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/nevenokifibizutifuzozaxan.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1631751511/file/manotokonefugajebesukobig.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/tubupagor.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/77358898094.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/pimuxita.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/midipojoduzotamukakugi.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/dalipulujenepafo.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/86817728080.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a72f15e3---nodavig.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109041023489820.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/51675998577.pdfIn PDF document text
    • http://chieucoingason.vn/files/vobosudavurur.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_off0000b0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B6 14748 bytes
SHA-256: 45fd04a32a3f967a2d9a6398366714c193b4fd1c061793aa2acb3253475743f6
font_01_sfnt_off0000d579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 10676 bytes
SHA-256: ee655c7039ef5a8829499c590d0cc555569df07ab39d5e0e353bd2501b6d0f9e

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