Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaed686fbb19a2d8…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 22:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d8554b8a314d2dcfad454502f46bdbef SHA-1: 81523223e88914ce4dfcd278a84174a437a4ed87 SHA-256: eaed686fbb19a2d83183021bf88917e06998db783e2ab40031775c4cc4313493
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm with numerous disposable URLs, suggesting a phishing or malware distribution scheme. The presence of many unknown reputation URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://choinka4x4.org/cms/files/file/2928307773.pdf In PDF document text
    • http://przedszkolenisko.pl/userfiles/file/goliwivipiw.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/pexadokam.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/40200403459.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/rosixutaz.pdfIn PDF document text
    • http://njchemland.com/upload/files/kosevomawonekabetitokam.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e609c3d0---75284806819.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/64167470636.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/33470734186.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/banegilabowesumevuw.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/25376034659.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/jabamoxumujuruwedel.pdfIn PDF document text
    • https://777mto.com/contents/files/zulavaku.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/belulumon.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/15427956133.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/80658060415.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/pagolejifegixatiti.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/mefejojejudatekameweti.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/kigakukasemakamusezag.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/53714817844.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/nanewuwusajefevaje.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/94796555626.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/lurugokuwixejiboxujonug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=baixar+android+para+pc+windows+8PDF link annotation
    • 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_off0000dfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F8 10680 bytes
SHA-256: 7ff2883d74f9d13dd86111831730ee6f55bd76593c776d29543f4fe4c15d8afa
font_02_sfnt_off0001109c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109C 17836 bytes
SHA-256: 51692c9adf2b08d78aad79534b660970745b455c3d9a85b7735c3c1242423240

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