Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86a4187d2f9a049…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 05:12:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ba0defddad08ec6b40a63e053a333f4a SHA-1: 5f7708ebaf019bfb32412c6673bb31731e199910 SHA-256: f86a4187d2f9a049cf78201e7e0bc8e9a13ceee537c6d739c180be70ea4660ac
154 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with high confidence. Heuristics indicate embedded JavaScript and a callback phishing lure, suggesting the document is designed to trick the user into contacting a malicious actor under the guise of a support or billing issue. The embedded JavaScript likely facilitates the malicious activity, potentially by downloading further payloads or redirecting the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://kraski-chernila.ru/resources/file/gajasafapijitateveboku.pdf In PDF document text
    • http://dientrotiendathc.com/media/ftp/file/42553574579.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/talarizutiruvalokivako.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/subafowaxurixosaja.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/xupinatijoz.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/60669180219.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/93076811658.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/57146369629.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/lasifogov.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/gikejawukonadujepesoku.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/zujukexaxemufedevazexutav.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/88971486689.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210912_1DE0ED946BEB785B.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/15454708884.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/91449769647.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/rogigosizivenulu.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/mitotow.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/mizusudozugigezofabug.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/27842051722.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/riral.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/vivibugekij.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/61621528642.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/fatubudufu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+are+the+best+exotic+weapons+in+destiny+2PDF 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_off0000e0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B6 11120 bytes
SHA-256: 6d9b8ed6842f607bbcbe51728f9d02aabf2716268727f915a5339d3d4321e15a
font_01_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 17684 bytes
SHA-256: 37f0bd0649a96e9030f123b055c6a3741ad6206ed9168af573171a678c157c11
font_02_sfnt_off0001289e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1