Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1021a4a15b51f46…

MALICIOUS

PDF

73.5 KB Created: 2021-09-13 04:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 30ed34e4388b1f2f2b4c225ebc00e536 SHA-1: a3e532fbb37306724a10923d142ecef9beb57042 SHA-256: c1021a4a15b51f4686a52c0b2f7f443e9905b7b7b4a06db02e728358332b2c1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are flagged as part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-10044375-0' strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL distribution suggest a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://vonschickenconcord.com/uploads/files/31108102819.pdf In PDF document text
    • http://gewidor-gmbh.de/uploads/files/95410834788.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/50823979334.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/12287710557.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/diveretot.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/wibedabipikaketat.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109090527039979.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/50732617726.pdfIn PDF document text
    • http://bushurov.ru/images/files/jomon.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/83761343086.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/zurerakuboturubewig.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/lirupujesokiwosarepex.pdfIn PDF document text
    • https://anaksemut.com/contents/files/lofomironezobewijoraf.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/xemivuzamisuzomojojo.pdfIn PDF document text
    • http://sartor.ru/upload/files/zadoner.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/pedezisajuwoxe.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/lapijowilevexiwerulexe.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613548a2269e0---tovagevokow.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/liwogovuritaka.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/jajagok.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3f48835db---nodegeb.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630981842.pdfIn PDF document text
    • https://5udua.com/contents/files/1367079398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=properties+of+exponents+additionPDF 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_off0000ba6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6D 10548 bytes
SHA-256: 47ddb7e14062f7528864dfa8de771becec2bc0560b2686039bbf06725ce24a41
font_01_sfnt_off0000d29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAE 18156 bytes
SHA-256: 04d95857352373a4512fcadfcff1f6387256d49df2716e843d0ffc5ede8797c4

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