Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb9be291c8480c7…

MALICIOUS

PDF

72.6 KB Created: 2021-09-17 09:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 876c57b40dc00cbf05d7b0ed7ac868fb SHA-1: d5d8a37c631d67bd81365d7f475118b5eefbc581 SHA-256: 8bb9be291c8480c77b30904973a1b894d2dce3ec9e5e6f9cab96c79937fa4033
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=borderlands+3+local PDF link annotation
    • http://campbellelectronics.com/uploads/76230095839.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/jixiliwase.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/98667149434.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/surarojofotusuruleluj.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/13883704473.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/begutazuxunuputikasilux.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/61415598077.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/tikoloxoz.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/rasivuvupamunari.pdfIn PDF document text
    • http://sial.pl/galeria/file/32563648156.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/34941219386.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/1105875478.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/tupopodinilo.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/90263300560.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/mukexesufuvixamo.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/jowof.pdfIn PDF document text
    • http://mobilenmr.com/files/files/nitejixegabozubosiruxi.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/88129186208.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/23843999319.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210917054756_eml2ZWRhYnVqZQ==.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/botopugig.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/95687547281.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_off0000bb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD321 16456 bytes
SHA-256: 21cc2250e5e1e08c2f2463d9ee53676108a4171c350d3fe14bdae902f832762c
font_02_sfnt_off0000fd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 10396 bytes
SHA-256: c4f807dcfb778b4be20f48e96f851e89551600e2b853a99c03fae3e089224ecf

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