Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c89bca691a4310…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 22:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 391b6d4f04fb598dbab94239211ba59f SHA-1: 5035d51f3fae5ea440db81434d91c69422abda58 SHA-256: e6c89bca691a431079d451b857dd265b514180e7a9fe4480ddc79555ff5a1378
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection for phishing. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, suggesting a malicious intent to distribute links for phishing or scam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://e2ingenieros.com/ckfinder/userfiles/files/39262972248.pdf In PDF document text
    • http://ghibms.com/userfiles/files/44121763960.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/93226857681.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/jivoki.pdfIn PDF document text
    • http://lex.tj/img/file/kopegabixope.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/vexafuxuzen.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/zozanisunekixudo.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/pixalazunusugum.pdfIn PDF document text
    • https://gift2goa.com/ckfinder/userfiles/files/96922197742.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161337fc74fde0---kofedef.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/18805451431.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/nojesamudiwoxam.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/gepedojetozijusodirilibo.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/sapunadolebibuvuzop.pdfIn PDF document text
    • https://atiksigorta.com/files/63875145510.pdfIn PDF document text
    • http://mrrb.nexgendevgroup.com/files/78407860226.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/75563514045.pdfIn PDF document text
    • http://juncheng.tw/upload/files/rutijukisotamupuwo.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/75997101345.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///24422428055.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161310f1dcbbe9---lusafowegukivepaj.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/79843242785.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/tesufuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+meme+generator+app+for+androidPDF 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_off0000e3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C3 10848 bytes
SHA-256: f70ae7a562d442182211ae3d2381043d5a284289315c9aff32e876c0baee3450
font_01_sfnt_off0000fc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 17584 bytes
SHA-256: de86aa5c5d7226bd0958a730ad357c1d6b94c9e2778ceab789a277622860a2bf

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