Malicious PDF — malware analysis report

Static analysis result for SHA-256 481b6497759a980c…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 22:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7896e7bccd04b5a6cdf60c17618862ab SHA-1: 2955169c862add9262090ae798ea0d474e511bf4 SHA-256: 481b6497759a980cf1586d0739c6aea652e5d3d39130a68db97e3faad1f188c5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests a business email compromise (BEC) or phishing attack, aiming to trick users into believing there are new banking instructions. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a phishing campaign designed to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • 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://impulsa.mantareys.net/uploads/plantillas/files/fevusino.pdf In PDF document text
    • http://screen.by/images/file/nojuwunezi.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/34814372571.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/xilijegawinevomovab.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/kovukusizaluro.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/82795735853.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/mubogidekupadinunagufa.pdfIn PDF document text
    • http://esangsok.com/upfile/files/87844754883.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/541f9711c4fa796dba574fab9bad81fe/bukurekidisidamadegetezaw.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/fifajifobipanewuregax.pdfIn PDF document text
    • http://njxinbell.com/upload/files/zerulagipovagemume.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/sepezabejezapegevoba.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210908_EB31009BB4DB5F1D.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/jowaz.pdfIn PDF document text
    • https://fasleh.net/Files/files/fibevawifitonepab.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/metajozorifepumijitut.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/64232897732.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/famixevezobobiru.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/61567536559.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/11714690667.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210916/files/20210916070950.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/zetosafo.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/gelivepidaniduju.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/kagop.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613425e0b6dfb---74929701463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=playstation+remote+play+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_off0000dc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 19172 bytes
SHA-256: 98fffe3a6b60fdda30987427950a9784030bac43d24420390be0f3049a67cff0
font_01_sfnt_off00010d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12559 10668 bytes
SHA-256: d8af996867c962222e342909f2f1b6c6acd0fd9324c1e1d9c89cd21fefbe3fdd