Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50baa4ac3a30baa…

MALICIOUS

PDF

79.5 KB Created: 2021-09-12 21:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4d4a92c281e002db3d791128b6daf571 SHA-1: bc2ea164ce4081875512ce5faf311403bcc61a2f SHA-256: c50baa4ac3a30baa3493e382eaf6b136b6132e289d770ff35f548ae761e07b5c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to open a password-protected file, a common tactic to bypass gateway security. Numerous unknown URLs were extracted, suggesting a link farm or distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • 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://builderall.info/userfiles/file/1870537194.pdf In PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/musifibutikuwiwasovopara.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/tuvenafegasuni.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/82739063601.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/divifosetewena.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/82714702375.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210905091432.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/zupop.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/kikafujevuxuzavedamore.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/18818690686.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/goposasuvimojajagaxa.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/57655815395.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/tusokosuzebugufele.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/fawufebiriw.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/10439142701.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/vaxuboworodowelagikiwovud.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613852d1eb67f---39205542897.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/8820455843.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/77653647189.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/dabudumake.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/monilipoli.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/72510711151.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/19125189177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=wifi+file+transfer+android+freePDF 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_off0000d592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 10340 bytes
SHA-256: b23bace2db5153662925d034c1b2441f728f1dd5f509b7658f7f7bcc0f37d95e
font_02_sfnt_off0001051e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 16812 bytes
SHA-256: 62b632f749e102d25581f0b3e3f607f01647dda82aa7e739e3d5d41613a3b52d

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