Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d7bcd555f43b8e…

MALICIOUS

PDF

80.6 KB Created: 2021-09-09 01:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2b3db05195d4d9c289433a708d1a9fea SHA-1: 3cd7c2b05b66d4d95ca5fe0ddbb550a067d434e8 SHA-256: a3d7bcd555f43b8e45012385686eb9202d71b3b602a82afb5a90911b42b3069c
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 high confidence. It contains embedded JavaScript, which is often used to download and execute further malicious content. The presence of numerous external URLs, many pointing to PDF files on potentially disposable domains, suggests a link farm or phishing lure designed to redirect the user to malicious content or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://czernavendeghaz.hu/admin1/file/razikalezot.pdf In PDF document text
    • http://sparkpro.lv/content/file/jitux.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4hmqsl13n1vghciocnkje9irq6/62419198040.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/98863927041.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/91685211309.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/dugavidoxogil.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/93088426546.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/63587055399.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/56910171513.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/guzeti.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/1533043844.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/55436657610.pdfIn PDF document text
    • https://kar360.com/resimler/files/tofixijurapasogutazakor.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/44441015589.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/89946113415.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/72862115503.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/liromobukabubelitosema.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210906_020050.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/81351120241.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210902180952_1842369365.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/ridor.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134a1a2568dd---82489828087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+use+gif+in+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_off0000d4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B9 10660 bytes
SHA-256: 47ff6fd8f510cae26994024fc376ea5f4859c36c666d3e94b26bd8feb236e276
font_01_sfnt_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 18220 bytes
SHA-256: 28d7027cd397cc6836610510098cf62767a64801f2b58625e78ddedf4dbafe65
font_02_sfnt_off00011cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.