Malicious PDF — malware analysis report

Static analysis result for SHA-256 872ecdcf86170fb3…

MALICIOUS

PDF

79.7 KB Created: 2021-10-06 06:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 70912ad2ec96806949bd7dd045d703d7 SHA-1: baf9ed4883f180c52eed58c8f63b21b87f6c1ace SHA-256: 872ecdcf86170fb31f68cfab8cbc7f97c09f7c617bf71424f88f743e1a278172
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious websites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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://chcial.ru/uplcv?utm_term=addictive+drums+2+no+gui+boot+found+windows+10 PDF link annotation
    • https://smartbrand.ro/mm/file/velibow.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/zisidetevi.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/80525419731.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef47bd4dfd---museraxuso.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/tipuwefukabo.pdfIn PDF document text
    • http://orem.mn/uploads/files/65146462716.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16154396fd19df---gagipaseremaponur.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/jonasonewivukopima.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021092203570863.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/dawonagakovar.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/bizutud.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210923181316.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/69987159353.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/97272830501.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/ginakevejukadipetinafep.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/17962342966.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/tizowivoxalumotixoburise.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/26321442247.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/ditonibekazunigume.pdfIn PDF document text
    • http://sciattella.net/images/file/50343986689.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/59311117463.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/16001917290.pdfIn PDF document text
    • 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_off0000cbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEA 11280 bytes
SHA-256: b51cb6eaa1c7b6858a31e1f4ac46f08dfaedb79cabb9732a06f3325cac139f18
font_01_sfnt_off0000e659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE659 18672 bytes
SHA-256: f69be8bbfcbe3debe10aca0ead2715022dda9c4318effab386263a2aa95d6be0
font_02_sfnt_off00011742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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