Malicious PDF — malware analysis report

Static analysis result for SHA-256 b126b01c022f7204…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 07:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a53e6caa9577545c119360ff0a8fbc7d SHA-1: 573cd2d33a6fc4eea7b583591dd7d92a1c7dabd3 SHA-256: b126b01c022f72049b3858b1ff2d2b7ba57c8d6d96d8f33cbce8792e09858352
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external, potentially malicious domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and ClamAV detection. The ML classifier also flagged the PDF as malicious with high confidence. While no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://krisoc.ru/uplcv?utm_term=nouns+that+start+with+the+letter+y PDF link annotation
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/40285399445.pdfIn PDF document text
    • https://shidoremicrosys.com/media/lorinebafepesuwugozi.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/popifupekugirifu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161423b3bcc60f---26810008768.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/97043241523.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/sisupezipusanidafoxi.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/tukoninowagipizu.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/14926500580.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-7/20210907072434201008.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/sejajifakedimemisikowukem.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/jisokujupumo.pdfIn PDF document text
    • http://chinalabware.net/d/files/tamivuwok.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/ranixowupum.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/50431821342.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0a31c570---25173538372.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/fuvipupemasasagosalax.pdfIn PDF document text
    • http://pbpharm.com/upload/files/moxasazedesiwi.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/30467556916.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/dutuxapozexopez.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/domamunaxuwelub.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/53541784852.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/juxonilivofinisunafosek.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/55083808796.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_off0000d826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD826 18712 bytes
SHA-256: 0a99e4fc5de882b5ff32638425cf30cdec7670694d30da85bd9dc8b3499c8a62
font_01_sfnt_off000107b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 10484 bytes
SHA-256: b5ee2d739bf044fc1ff0b6d20150dd6ccd0a0494f5d23b2d1d9a23de92d2afc0
font_02_sfnt_off00011f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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