Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9ff850883b32f7…

MALICIOUS

PDF

79.7 KB Created: 2021-09-11 04:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 266711a657ebe0b262139896eb23c5c0 SHA-1: adbe6489f13897209290e2efd64767160b838f64 SHA-256: be9ff850883b32f7286131f6dc37b9d58194a1b5af8082bcbe8cd9df2bab5f0f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://geotersrl.it/file/ziledegelof.pdf In PDF document text
    • http://maidichike.com/upload/files/19918422735.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/63531680198.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/lofaralofunogojene.pdfIn PDF document text
    • http://ccadl.com/files/20210902093043.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/lodepiwevasazevira.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/dizovifujuluxukekimed.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/wulujidabarejimamato.pdfIn PDF document text
    • https://titishop.co/upload/files/97866810722.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/pikogidodol.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afed6a3a7e---ximef.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/mimijewi.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/61020078400.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/34460585731.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/furijavi.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/mawerejagafobupoxuzem.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/125403232.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/38812299503.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/32176494696.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/82863049407.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/nixarizupaputixedoxexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=true+beauty+free+watch+onlinePDF 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_off0000cf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6F 18216 bytes
SHA-256: c707fc096cd8adf8cd65bce54cf4a273b5adc0e2197b3940ade641651bf25ed0
font_01_sfnt_off0000fee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FC 10668 bytes
SHA-256: 4e1cd9c98d303a986484b214f2366eff3abc7771f20fe697cf48833d643cb10d

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