Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f53498dca225a3…

MALICIOUS

PDF

83.0 KB Created: 2021-09-22 14:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e9945874b9c3acad217d87c8e573127b SHA-1: 7a3455470a6c1d4e79cd365f01d79ee9678a6749 SHA-256: 87f53498dca225a36354127bdc71aa025dadca879dc4ef2a6939cdfd8fea871d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing attempt. It contains a large number of embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users. The presence of a QR code lure heuristic further supports the phishing pretext. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML detection indicate a high likelihood of malicious intent, such as distributing further malware or conducting credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://allytemp.ru/uplcv?utm_term=qr+code+from+image+iphone PDF link annotation
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/zimevobelowefuzoniripunep.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091105004890.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/28335892361.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16147d0bfbb777---ribolazilojozomuxejijot.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/rivumukovukupivekazaze.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/teluzalaberoxovesufezat.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/2450980592.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • https://gentrilieu.vn/userfiles/file/22759804804.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2d0b00fce---65880801110.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/6871540784.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/rekesugipofuvala.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/nidakarefume.pdfIn PDF document text
    • https://posh.hr/files/77900888610.pdfIn PDF document text
    • https://kenadong.com/contents/files/puxepukedu.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/59526360616.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/50242265724.pdfIn PDF document text
    • https://eguiders.com/uploads/85156997199.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210915_8D118E828D25BA2B.pdfIn PDF document text
    • http://anm-av.de/uploads/files/vimukafinenewegomis.pdfIn PDF document text
    • http://rapet.hu/files/75653255343.pdfIn PDF document text
    • 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_off0000df5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5E 10816 bytes
SHA-256: 44ee1e3bc48564792e8f24edfc0a5b998126ae2c43701516049a7970047b2fc1
font_01_sfnt_off0000f7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 18052 bytes
SHA-256: dd4c8ac83ce7e265ff9cae21f92f88116c9f83804aefbcd88b045be10d1c2908
font_02_sfnt_off0001268b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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