Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07c402a34801b61…

MALICIOUS

PDF

71.6 KB Created: 2021-09-30 10:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d91a191173a0a3bb644a013cc38e80ec SHA-1: 007e844499794485e18cb0f597735be3cde3a7cd SHA-256: a07c402a34801b6131dd3dfbf5be68b850e6a64d89148b690b090cf18b258c0f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://drafthe.ru/uplcv?utm_term=redmi+note+9+screenshot+shortcut PDF link annotation
    • http://heathrowairporttaxi.website/userfiles/file/92785252957.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/20481510793.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/mapisawitiwabijikifuxag.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///rijivaletesopu.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/96667218463.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/76393544807.pdfIn PDF document text
    • http://xn--12cnpa1crj9cff4b4eybemi0af5u5i.com/ckfinder/images/files/pijugo.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/zinewanofitojewofidobedil.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/95801263509.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/sumemoxuxiwatuwefor.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/15103940411.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/34680147298.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/95694679241.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/rigukujamugigaxigisi.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/suzelakatijeduxa.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/78025512891.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/vevawapevinajomelumux.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/12922312633.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/27607369404.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/38493444154.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/babonimuvanivopa.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/17465942246.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/91713420799.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_off0000b24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA64 10740 bytes
SHA-256: 548146adb8aade5db03faa13b018d1bb08a383e8fbb6d130badd3f3ac339e4f4
font_02_sfnt_off0000e2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EC 17344 bytes
SHA-256: 0ff9715bd7903af5b6b9d58f210853a17d231396b0d9fae8529c61739c463045

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