Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ab3506481911ab…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 01:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 198da50189f54edb822f1cb0bf8fcab3 SHA-1: 06475b5105815ea50c84b1464bf45ca8b0f1e6ad SHA-256: a2ab3506481911ab54bc03e9e0d2057edf39aac73f13cc0072cb1b659311911e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and it contains numerous external URLs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://pistant.ru/uplcv?utm_term=turn+off+speech+to+text+android PDF link annotation
    • http://an-professional.ru/img/files/file/lapabubaravave.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/22048067782.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/31077725100.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/42468046473.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/86467652510.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/vagasef.pdfIn PDF document text
    • http://dogable.de/userfiles/file/87061902544.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/23989606966.pdfIn PDF document text
    • http://dunakanyarfesto.hu/ckfinder/userfiles/files/62218074178.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/97274842969.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/70197992090.pdfIn PDF document text
    • http://speak82.com/_UploadFile/Images/file/bewaf.pdfIn PDF document text
    • http://indemo.pl/Image/files/bawed.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/86087581977.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371c0534cca---voxawuwiw.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/55021575389.pdfIn PDF document text
    • http://classtool.info/upload/files/kaserewizikawon.pdfIn PDF document text
    • https://rossbeede.com/userfiles/file/vowigup.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/wepalomefapumejurale.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/lanokul.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/77920539424.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/84858351125.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_off0000d871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD871 10836 bytes
SHA-256: 6dda2fbcab0fa15c6e0650708d6f70a5f011950d493dd3129d48f8eaa74e7455
font_01_sfnt_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 18240 bytes
SHA-256: 45dfb2798cfdeca34644968b8ee019b8e2b4f8e0e9500407b27135959408bcbf
font_02_sfnt_off00012075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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