Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9dbefd0a2cbd473…

MALICIOUS

PDF

97.9 KB Created: 2021-09-13 07:02:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 74ff3d0cdf6f0580b8571d37b2b9cfad SHA-1: 70d5bb376fbcea5d716c78ef0e9ba635303955ce SHA-256: b9dbefd0a2cbd473bbc9e569d08451fbeec3b8eacf39f6b2e8d1e19dafde8a9c
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of phishing and containing numerous links to potentially malicious files. The presence of a download button lure and password instructions for an archive strongly suggests an attempt to trick the user into downloading and decrypting a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302f8b14449---83403986609.pdf In PDF document text
    • http://nceed.kr/pds/userfiles/files/24598526868.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/pukodevolana.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/67971442590.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/47939134422.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/79219163266.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/27514582174.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/venuxutafegemigozajare.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210910190649.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/rivevasolezetegel.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/71050729254.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/42550761458.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/15021719331.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/39600284235.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/tawawi.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/nusixaxumoxujonanazugowo.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/70551115051.pdfIn PDF document text
    • http://effekt-film.de/files/file/nafibasezedulefuwepigake.pdfIn PDF document text
    • http://www.toptehnik.si/images/38440241043.pdfIn PDF document text
    • https://chineseclothingonline.com/File/xamubajoposarerogew.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/344157556.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/72733140556.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/vixixizetonadeketunop.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/rorisawugepozujezat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=http+injector+apk+downloadPDF 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_off000113a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBB 10636 bytes
SHA-256: be4d6a8fb7481a229826e2eef386773faa1cc878811b6914b6c78f278cefcbff
font_02_sfnt_off00014424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14424 20296 bytes
SHA-256: 2591d4a345046174ed398fc93ee747146bb2490f08c8dfe0cd2166d45a242cb8