Malicious PDF — malware analysis report

Static analysis result for SHA-256 1479f476aafb5d8a…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 19:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: badf1fb030f63fa23f34bfb05b49d591 SHA-1: dd8a9e1ef5092114ebba1a1c3dc65bc270828a81 SHA-256: 1479f476aafb5d8a59481ecf3917ca1d69d7b1eb0059a8aded507df1a38ec9cb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a large number of external links. The embedded JavaScript likely serves to execute malicious code or redirect the user, contributing to a phishing or malware distribution scheme. The extensive use of external links, many pointing to disposable domains, further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://spitalmoldovanoua.ro/ckfinder/userfiles/files/nafedidovenafafobobezage.pdf In PDF document text
    • http://fgosvo.ru/files/files/likagizokeronoganuj.pdfIn PDF document text
    • http://vit-physio.de/file/relokaloligita.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210906145020.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/56542024615.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/subomajaresiga.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/85571394987.pdfIn PDF document text
    • https://dm288.com/slicice/file/dexaxijug.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/19977133972.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/90401781297.pdfIn PDF document text
    • http://mdtrend.hu/files/file/sopovifatola.pdfIn PDF document text
    • http://erpos.sk/data/files/larituxilulifotozoju.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/dozeb.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/fafavopa.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/75446261797.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/11411899705.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/35973918644.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/37666964192.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/dinisuxabakelidozobumoguj.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/13856091008.pdfIn PDF document text
    • http://kftchem.com/upload/files/32019681260.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/31336846601.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210917034522_azw6pn.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mirror+link+phone+to+pcPDF 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_off0000e873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001008a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008A 10228 bytes
SHA-256: f785e45abbeb9352bc3e28c0018e3990cc18cc084b63ef61d9c0f44a9a084479
font_02_sfnt_off00011759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11759 18312 bytes
SHA-256: 7561f2e7adadf23e5f2b56715cfd010fb70305f22792bb0c9d2d2ffa77e7b9fd

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