Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa709a057cad817d…

MALICIOUS

PDF

80.2 KB Created: 2021-09-15 21:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 564e956ababd2dcf955822150f912171 SHA-1: 8f3a7cdef714491fd3d6ae561dd2582b7a8b0e63 SHA-256: fa709a057cad817d69ecbea0d15ab36767e2cedb8a1478c29bdc3232a33101d6
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, with many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • 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 https://alaskaproauto.net/nbloom/fckuploads/file/fasaposobifexawodolak.pdf In PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/74399180144.pdfIn PDF document text
    • https://oldd.adventurenetbg.com/userfiles/file/81217409522.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/24093729376.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/bakavipobopujadodaxip.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/bumizi.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/10497604670.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/19938133302.pdfIn PDF document text
    • http://drironcat.com/images/file/25836046894.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/811248883.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/mabajomaw.pdfIn PDF document text
    • http://canadianrockies.info/files/file/73083075160.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/wilifibipuxupeneravitaxi.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/zabeburetus.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/miwevatizitev.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/disagegogaterekopujurur.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/jakulojadufaben.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210902085015.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/59787901400.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/62610581925.pdfIn PDF document text
    • http://dharmapuridiocese.com/svnprojects/DHD/Source/images/files/57938330396.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/nokisegar.pdfIn PDF document text
    • https://luatsubienhoa.com/upload/ck/files/25811536581.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/wonag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=shaders+minecraft+mobilePDF 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_off0000d427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD427 10956 bytes
SHA-256: db3827109aa5431ee3470ffa226b98312bf1a02cb82774f6f2af647215f415b6
font_01_sfnt_off0000ed4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 17708 bytes
SHA-256: ca13c65a415459c0b6d3334e551bc399afe6d9c14daa8887f5b9a4c2233f0d90
font_02_sfnt_off00011b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1