Malicious PDF — malware analysis report

Static analysis result for SHA-256 15583ea0fe52876f…

MALICIOUS

PDF

71.6 KB Created: 2021-09-28 08:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e61451b5b1d9b218ddaaa3d4b213445 SHA-1: 5777f6ccf8e1b75b21b3e75b51e37aadb67165e5 SHA-256: 15583ea0fe52876f5cdee02aebd1ea11d18e12275f7631c73c23f03c737c8057
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to potentially harmful websites. The 'SE_CALLBACK_LURE' heuristic further indicates a phishing or scam pretext, likely aiming to trick users into clicking links for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=wetter+app+android+tablet PDF link annotation
    • https://marathonblainville.com/userfiles/files/meninusorokodunirip.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/rawugojurotepuxamewewop.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/jipejuwimulupejaka.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/27816807156.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/99682688446.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/32887622714.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/34745197724.pdfIn PDF document text
    • http://sireny.net/share/files/20392438576.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/dujatomanusezofanutuw.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/47821581868.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210913_141925.pdfIn PDF document text
    • http://tianfonmm.com/d/files/xejizijexovenav.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/vaxazuno.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/90373606067.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/50822524831.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/bipetumofazujirax.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219111727141621.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/68736833895.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/77986410881.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/zigewexako.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/73801730104.pdfIn PDF document text
    • https://777mto.com/contents/files/29206802074.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/sabaxojaxobomesop.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/56133094778.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/pupuninudodijadeto.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_off0000b3a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A1 10352 bytes
SHA-256: 34dd82c7c31f77d16cefd538f14034751a915553911593cbd3c1749f65e56a68
font_01_sfnt_off0000cacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACD 17204 bytes
SHA-256: d7c40d3a9b62aa603856bebaf323fb1703436c3c7b359cec556e63840f62bd17
font_02_sfnt_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1