Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f0afa8c01cabb1…

MALICIOUS

PDF

70.2 KB Created: 2021-10-04 02:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 58f1ca66fa7008404e9d8bebfb660a25 SHA-1: 393601b778ef9049f6099de1383ef843bc8d98f2 SHA-256: f2f0afa8c01cabb1fb1ee4c8b06cdb4b1950102ad55e6f7f25a31a3381386269
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, which are characteristic of link farms used to distribute malicious content or conduct phishing campaigns. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://embeddedhr.com/ckfinder/userfiles/files/pomibabixalizim.pdf In PDF document text
    • https://matricula.netlandschool.cl/files/48271791222.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/rogepaw.pdfIn PDF document text
    • http://lulanjina.net/upload/files/wekonupotuzogeriw.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/13839742130.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/mewadudilo.pdfIn PDF document text
    • https://datajournonepal.org/files/vofagojenuvulelib.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/22802420699.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/45705854554.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/31247439231.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/3062229824.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/81153159082.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/xuwiforoviretoza.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/kafusakodeninomo.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/tuxagamipew.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/97443173927.pdfIn PDF document text
    • http://dsfly.com/uploads/files/gekadowulolisit.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/27511592390.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/61454119813.pdfIn PDF document text
    • http://fini.hu/userfiles/file/50813612135.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/49120811505.pdfIn PDF document text
    • https://eurotig.ro/file/lagapaj.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/zaxadupofonixegifiger.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=common+cause+of+stomach+ulcersPDF 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_off0000b11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC934 10640 bytes
SHA-256: 6e9ac8db6169f0cd1db33566ef52ca4df32516ca0d7dadca9fe1ebd17c1d0a8e
font_02_sfnt_off0000e169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE169 16844 bytes
SHA-256: dd0a1e171cb58dd76210c752eb981f1d4c1d8153fd025ff3f08aaf42f297d5cc

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