Malicious PDF — malware analysis report

Static analysis result for SHA-256 05fb21b934dee62d…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 05:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e0c181ab180cd3a2c0b43da69c76437 SHA-1: 9e0e825693e75f344a11107bc045c4568355ab16 SHA-256: 05fb21b934dee62dff557f374deca1e33af054667e2970f429918a65201714e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution attempt.

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 https://philabc.ru/uplcv?utm_term=apk+simulator+truck
    • https://okud-istra.hr/userfiles/file/xaxawid.pdf
    • http://nickels.design/ckfinder/userfiles/files/wiponobuxudezej.pdf
    • http://andrelandberg.com/userfiles/file/19810406904.pdf
    • http://frickcontrols.com/uploads/files/5638394408.pdf
    • https://dollarplus98.com/images/upload/files/fazepot.pdf
    • http://eis-pieschel.de/UserFiles/File/21505504193.pdf
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/nonakamaziramuva.pdf
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/64742147914.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdc687ccca---torazegazonalama.pdf
    • http://bfttacg.marketsearching.com/upload/files/32386666854.pdf
    • http://flapboxes.custompackageboxes.com/userfiles/files/wewerorexesaxesik.pdf
    • https://pagodatalk.com/_UploadFile/Images/file/52034931007.pdf
    • https://optimustelecoms.com/ckfinder/userfiles/files/63561149793.pdf
    • https://signatureshreyas.in/userfiles/file/8245677116.pdf
    • http://lulanjina.net/upload/files/1163405936.pdf
    • https://groupekheidri.com/ckfinder/userfiles/files/27645358773.pdf
    • https://netpage.info/userfiles/file/91435725908.pdf
    • http://incomsistema.ru/ckfinder/userfiles/files/kofetumenaror.pdf
    • https://sasalidayanisma.org/uploads/file/38690398060.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614c51184dc5e---21135151849.pdf
    • http://profil-metall.de/content/uploads/file/2018390323.pdf
    • https://evergreencans.com/userfiles/file/85135641314.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a88b46e54---14730267933.pdf
    • http://kaupa.cz/userfiles/file/13864993732.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B5 16792 bytes
font_01_sfnt_off0000c9c7.bin
ef81f6507c5a58f48e2f16cb7315e45359a6e5649ad0c47c0038d312df695862		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C7 14988 bytes
font_02_sfnt_off0000effd.bin
09dc5e88feadb77bb28219a4ecd1363f2329d474f67540fbdf90b198b87559ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 10472 bytes

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