Malicious PDF — malware analysis report

Static analysis result for SHA-256 8deb75d81bf2a913…

MALICIOUS

PDF

84.9 KB Created: 2021-09-15 14:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f30c77ca38dfdab13f9224c3ee816677 SHA-1: 5a4d767c4bd047d7281ebbce9ac0be5dca2c27bc SHA-256: 8deb75d81bf2a9130f8512866eb4a438916fb308bc150cf3d3bbaea09e0d88ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. While no executable scripts were extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery. The presence of many unknown URLs indicates a broad distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://bn-biz.com/userData/board/file/17285492780.pdf In PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161319e43d0d43---rejamowoxinudowemeluzo.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/ralizevememuwutojawevo.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/vefubexuvotagizexi.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/2031532255.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/wonunovuvasipumefa.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109071338256412.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210910025454.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/dobakebovuxereraka.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/vazosa.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210914055525_m8sg83.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/53190026129.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/20871233755.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/55467517890.pdfIn PDF document text
    • http://identik.hu/editor_up/17802468968.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/57990547101.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/49862097324.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/22529736769.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/48al5ft0i1rmeha3b3vo8phpq7/99366395253.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/rurubupukuridafisuse.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/40158005188.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/masus.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/lewixatiwamesezol.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/54492706518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=stickers+on+android+phonesPDF 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_off0000e746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE746 17656 bytes
SHA-256: 46d33b9d7db39e81fce74718f7158517e8a7ac06cc3d8ef9789f3a6beb691640
font_01_sfnt_off00011582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11582 10732 bytes
SHA-256: 8502449f5ee96e9cc8e7450c9e4648ab7e75ad3f0bf1344ea8a0890438b2d801
font_02_sfnt_off00012e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1