Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f0b9115677e832…

MALICIOUS

PDF

74.0 KB Created: 2021-09-19 02:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d698fd197139dd7dee6611e629fdd360 SHA-1: cf01660003846df4e03a389f2c6c49a3cb32c5fd SHA-256: 78f0b9115677e8327d5178d3a652e4a01f9a1c14023b3be8a423b7ba61502d64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or scam campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to funnel users to various external sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's used as a lure to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=pes+2022+android PDF link annotation
    • http://ablerexthailand.com/userfiles/files/40271873247.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/jefurevinakivusulurusid.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/zeloxuvajegaz.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/15118009799.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/43389749023.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/tetizuvifawokava.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/90896972159.pdfIn PDF document text
    • https://southafricapools.com/contents/files/53373977498.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/wesevikijuk.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/porewimo.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/78812369258.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/26238035762.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/3257865258.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/bovutikilajogajejosur.pdfIn PDF document text
    • http://shamayachts.com/upload/file/41138670203.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/lotevilurowitagir.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/54705782100.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/50469271592.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614009c3034ea---95911203787.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/xireramufipegapojaxose.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/15582433088.pdfIn PDF document text
    • https://ratodua.com/contents/files/zisisiv.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/41974440508.pdfIn PDF document text
    • http://mp-journal.com/media/file/kukonupidazepuj.pdfIn PDF document text
    • http://huefpdf.org/upload/file/17413844721.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_off0000c052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC052 16728 bytes
SHA-256: 0850cc4f63dd19e76145a5978ba0f589068dc70bb1d8436cbc4a467d28ec6453
font_01_sfnt_off0000eb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB42 10340 bytes
SHA-256: 4e1a32034526528e95f63db1659ed10f34ed22127cbd23321fae63b3cf642253
font_02_sfnt_off000102c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1