Malicious PDF — malware analysis report

Static analysis result for SHA-256 91de00185ad6d511…

MALICIOUS

PDF

67.3 KB Created: 2021-09-29 09:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: caaea84f02d4098face96c37771803cd SHA-1: 2f8cc2f7cd18c4b08da62fcf3763b3e0668370e4 SHA-256: 91de00185ad6d51141876fdab1c363405e10d6ada3616269eaa82232eb5cce41
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to hide clickable elements. Multiple heuristics indicate it functions as a link farm on disposable hosting, aiming to redirect users to potentially malicious sites. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a trojan disguised as a PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://talaa-obour.com/webmisr/uploadwebmisr/file/50291189033.pdf In PDF document text
    • http://massageindex.nl/images/uploads/97989936723.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/fotagu.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/94890060101.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/purez.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/luzekijupi.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/tetatuzaluwurepor.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210922151927.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/ranotirozivugowizovek.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/pagadokozetugonopaz.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/wobopawosediwatubolupir.pdfIn PDF document text
    • http://metapolar.hu/tmp/kujimisuvitegarojitiru.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490e63aa14b---galirelewatuwevi.pdfIn PDF document text
    • https://estoniapools.com/contents/files/73870385001.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/49624891629.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc00ec3459---36668256956.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/90108216353.pdfIn PDF document text
    • http://elpijisystem.com/file/3002530763.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/fokiv.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/vudodofegunikokopub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+disable+pop+up+blocker+in+android+phonePDF 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_off0000aa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC264 14284 bytes
SHA-256: 134a911f3b2039aded52447024e7df4b73c2324a61e4233fd01a6638cea58717
font_02_sfnt_off0000e5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 11020 bytes
SHA-256: 5a50b4544d5486b833909fcf75047e37c8eba300d7dfffc5440ff36645cfd4ef

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