Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ceefcd4aab87810…

MALICIOUS

PDF

74.6 KB Created: 2021-09-21 07:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d7d316eafbb4a96c4acffca3f1faaa1 SHA-1: f24cfafb790bd5d9f99f504b4342fadea3c18789 SHA-256: 4ceefcd4aab87810ca65a8d72585b1a7d44cff7cd42ee40e1209c11c3d3113fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The document contains a large number of embedded URLs, many pointing to disposable hosting, characteristic of a link farm used to distribute malicious content or facilitate phishing attacks. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest this is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://regimhotelierbucuresti.com/images/userfiles/31923805098.pdf In PDF document text
    • http://soles2walk.com/data/file/gesapoko.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/72333468199.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/1298166263.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5eca7305176c0c5e6a780d9e45ce93ac/87366840843.pdfIn PDF document text
    • https://asken.as/bilder/file/xebakukejinoxukeluvate.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210913194706.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/27129295123.pdfIn PDF document text
    • http://lokalizacja-gps.pl/userfiles/file/gofomizobolaridata.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/zukikaxik.pdfIn PDF document text
    • http://suranareecommand.net/UserFiles/File/jarolanatajerededu.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/jafawilamopodenewemokuja.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/gotasaxufupadixog.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/65378130100.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/joramizobulade.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/topazeliw.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/99485959922.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/koretogitasidosapoza.pdfIn PDF document text
    • https://qkon.ca/images/file/fupetabasesekesugapapilat.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/wubudofamodosabisusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=when+do+the+new+my+hero+academia+episodes+come+outPDF 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_off0000bcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC5 17948 bytes
SHA-256: 1d4963f1115505e7be036e6397da8383b0529a6d7e3a0b45ea32e1bd9640e46a
font_01_sfnt_off0000eb7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7E 11024 bytes
SHA-256: b4f1461d02f8e7f7a8bc5f97b033442c5831e66287aeddee4ca24962340bd621
font_02_sfnt_off0001050a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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