Malicious PDF — malware analysis report

Static analysis result for SHA-256 c984f873ed610dc4…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 17:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c34a1840571e3520b779cec4bf63859f SHA-1: 705e3ff1d1683aef43482b2402a2bb4b2936baa2 SHA-256: c984f873ed610dc48d1678c4c50161ed56f449d36b59b25e7a5b2ed32b049636
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, exhibiting characteristics of a link farm hosted on disposable domains. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be instructing the user to decrypt or access an archive, a common tactic for evading gateway scanning. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=convertir+varios+jpg+a+pdf PDF link annotation
    • https://open-call.fr/uploaded/files/13674971301.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/tuwabaxemufo.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4ibci7h72cuphvv13jpf7v4uu7/68428521268.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/wadizebeja.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/46603204932.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/weselopef.pdfIn PDF document text
    • http://honda-vo.com/upload/file/wizam.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/48488496180.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/mizakoxojugexenoweziwipu.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/nomagaponenakimezavef.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/66845586143.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/80166660178.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/74068088729.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/jobovof.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/60552580556.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/50459097228.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/fuxazugop.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/kotimodaxawixixodirovu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/fipaxobatowinejixububak.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/40780393540.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_off0000d9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B0 17616 bytes
SHA-256: d963c1d1d53b0b09d279e48cad603be0074d92b18f467466d62c4a5ccf5a7a0c
font_01_sfnt_off0001077a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077A 10852 bytes
SHA-256: 7eec66e1556c1f0b70386ccbc2c276f27b333566096f1a263483382c425dc87a
font_02_sfnt_off0001207e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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