Malicious PDF — malware analysis report

Static analysis result for SHA-256 73abdf758b7126dd…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 16:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f7100d601cf4a6b12bbabe1c2a3b9a53 SHA-1: 003dd04338c128464cec373b1f72d40d027adcdc SHA-256: 73abdf758b7126dd839681a1244cacfb095b43a2377cba163c5cbb49aab70c14
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or SEO poisoning campaign. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a 'Phishing.Trojan' point towards exploitation for client execution, likely via a PDF vulnerability or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/balixebotezosexu.pdf In PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/bibumuxeriwixosukufeb.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021091709010987.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/bususenorufamujivavikorod.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/97025272856.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/gozun.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/duvexapujudojo.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109040234324502.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/rojopedofatarojuwikosorak.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/67543628538.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/noforunetivovora.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/74964256811.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/55924306441.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/vodidiraralegisut.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/46405485242.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613672ce862ee---mobefinoru.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/rufovavazuxanemadada.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/tipigenirugekutom.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/vk7u4NDd8aLX.pdfIn PDF document text
    • https://manenshop.com/upload/files/xijumepopobasonovo.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/55986317986.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/89718120511.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/lanarisuwelisemisagiruw.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/4882390695.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=silmarillion+book+pdfPDF 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_off0000cedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F1 18876 bytes
SHA-256: fa7cd107597e1f5718f1e3423d090dc441193e4ce8fbf6881cc12fb3bcff490d
font_02_sfnt_off00011793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11793 10568 bytes
SHA-256: 290d756264c45bb3abccd4484896cc9fe080505734559165b1bf9604a047eabb