Malicious PDF — malware analysis report

Static analysis result for SHA-256 6159ac45045621a2…

MALICIOUS

PDF

85.1 KB Created: 2021-09-19 06:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eac5492a1e98aafd9260b704b6c10392 SHA-1: b7db3b3cc7d78524c6fc0ab7db6923a04268054a SHA-256: 6159ac45045621a227e3e50cdf4e040b565bb5135761d33c6b7b757b94d0bca1
146 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of callback phishing or tech-support scams. The PDF contains numerous embedded URLs, many pointing to disposable domains, and one heuristic specifically flags it as a link farm designed for SEO manipulation. While no scripts were extracted, the presence of embedded URLs and the callback lure heuristic strongly suggest an attempt to deceive the user into initiating contact, likely leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://telewebmarketing.com/FCKeditor/file/48029764663.pdf In PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/336698987.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/mikix.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/gezabateli.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/39273935475.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/wazepinajavekorar.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/vumusi.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2c8766395---35538421668.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/tugedorumotuwoma.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/90530205445.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/92121529921.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16141cb7c4080d---xebolipivakizufinosera.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/budofalavixurinixolas.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/56202238344.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210914090829.pdfIn PDF document text
    • http://sdes.in/uploads/33142731997.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/gudusiruzobesir.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/terodapimu.pdfIn PDF document text
    • https://soechi.id/userfiles/file/87021996962.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/60369689197.pdfIn PDF document text
    • https://menu2uplus.com/images/file/nutupimimiwe.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/mofadazofit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=downfalls+high+streaming+vfPDF 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_off0000e54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54C 10816 bytes
SHA-256: a98fa0d4b29c5289c031b839c04496e80fa82c84f020d2f78f7d15405b0d31a4
font_01_sfnt_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001162d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162D 18964 bytes
SHA-256: 74ace0f663cb94030fc7a44a40d648503b2d5bf872cd867b7eb01d12658a837d