Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48dafc6d16676c9…

MALICIOUS

PDF

76.0 KB Created: 2021-09-24 14:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 750e771e70f7e24259702c4663f68247 SHA-1: 47df8db3a3043138a1c916fd0b885aa0e4145ce0 SHA-256: a48dafc6d16676c937b251c67d49f55941c5196f48416ddbf300bf8cd0a90aba
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest malicious content, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://ewt.cz/res/file/55960733398.pdf In PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/gibudabewoxumoze.pdfIn PDF document text
    • https://2acontractor.it/images/file/falojuxadajogofesijozira.pdfIn PDF document text
    • https://mar3ol.com/Files/files/vudemewopozupizidub.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/datugepiwak.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/tusuloriribato.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/71512879510.pdfIn PDF document text
    • https://tckontrola.hr/files/bixage.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/an3va6jj3ea7mr0jf9g095tkdp/bizipiloxiwozobotebuv.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/62799114617.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f4b53eea8---rizupivenuzuxarevukosix.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/nolunoboxivifake.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/26269460353.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/86387385511.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/bixuli.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/toriwigirizonuzisup.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/68161763580.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/tibizibenerotuxawi.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/xotij.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/nunumugaxevose.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/supet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=dual+boot+macos+and+windowsPDF 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_off0000bd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58E 10628 bytes
SHA-256: 505936e9a69556664c4e562c332cff7c7cba81074df530e145ff756c6beb9a28
font_02_sfnt_off0000ede5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE5 20392 bytes
SHA-256: 4a51f1bf2159b8535c073adf7960133f8f404bb839a4269bf7e26c66346c7e60

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