Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c9bab2db8f12c1…

MALICIOUS

PDF

87.0 KB Created: 2021-09-14 07:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f2bcfd0e5850e36154f4927f2590ab09 SHA-1: 1c98a197e711bd3a6dc378987e45751e68092d48 SHA-256: 04c9bab2db8f12c1cea47164a87230f02766fd3cc1bff3ec199eeab0e50d5ed6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many pointing to disposable domains and link farms, which is characteristic of phishing campaigns designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it may attempt to exploit vulnerabilities or lure users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://nomylo.ru/uplcv?utm_term=episode+8+season+6+fear+the+walking+dead PDF link annotation
    • http://fotosvatba.net/userfiles/file/pareburuzuwida.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/mopobedemixajafeneluz.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/20653318607.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613877c60a2d4---55299080372.pdfIn PDF document text
    • https://nistd.in/userfiles/file/kesoxagigisinutibewobopos.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/36021824602.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/78609943564.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/42929082441.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/dozixewivokobidevenugus.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/10809536719.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16131395643ba3---6332516172.pdfIn PDF document text
    • http://xn--80aggmy8c6c.net/UserFiles/File/zuvukezaligegifibazuzowu.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/5007248656.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61354ECCD19D9.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/64795867439.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/datobuwoxulur.pdfIn PDF document text
    • http://art-ball.net/files/file/23135267213.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/12159838093.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/zuxawide.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/buxoli.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614001978d5d8---6604557485.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/xukuwelozebor.pdfIn PDF document text
    • 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_off0000eb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10388 11312 bytes
SHA-256: f6e837679d7cb957e80ba675c15ce502437fb155b1ed34737727a593d5b438ac
font_02_sfnt_off00011df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF4 18700 bytes
SHA-256: 45b219772ee737f38dcb9b0c8edcb2d3af30b8e88267620ba9591d1f628a3ba6