Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80cc0abd041a80d…

MALICIOUS

PDF

78.0 KB Created: 2021-09-09 23:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4df6f48caa71d49a926cb2ea0a220708 SHA-1: 340096993bbf4553ac9405f095199ecfc38bf8d5 SHA-256: c80cc0abd041a80d2fd43ff59c32ea3adc5b793b5df14f914a12076cd5afd7cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to link farms hosted on potentially disposable domains, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically calls out this behavior. No scripts were extracted, but the structure suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://laarakkers.com/ckfinder/userfiles/files/7648726824.pdf In PDF document text
    • http://architettorobertafasola.eu/userfiles/files/75022641658.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/tegom.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/fekopeporabewexekusibi.pdfIn PDF document text
    • https://tch.lu/files/files/gowomikujuragifateg.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/sapudixiwamodozeg.pdfIn PDF document text
    • http://guowangcable.com/d/files/xugilo.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/41265518281.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/nukavefasukotaj.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/rumevupo.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/31509615292.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/bivanewifimifotavapu.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/99304904527.pdfIn PDF document text
    • http://klemanpince.hu/files/file/25435979915.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/donamitobagebapup.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/lamowapuxivobik.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/bimisoromumavovodevawodom.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/59569220673.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/18edadebf334fcd2b3b42cebb933745b/63245007503.pdfIn PDF document text
    • http://belst.by/upload/file/nazaxajukav.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/xivokur.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/d7c635bac565f4957d5a3c6c58e0ac1b/94744745297.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/76672642160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=que+es+el+sat+pdfPDF 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_off0000c90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90A 19632 bytes
SHA-256: eea2651224c431020d8ff0161acf6e43dfbad2e88941743dde18e82b07377343
font_01_sfnt_off0000fb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB90 10236 bytes
SHA-256: bc80ed7d8004f715e7145f1358d890ecedae9612964f87dd0b77842152da4c8e
font_02_sfnt_off000112d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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