Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5288ee76c9c62d2…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 23:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fa927131fe06d8dff87ee562b4d2f6e9 SHA-1: 4d11557e798bc8caad3fb420faf89db0b68ef0ac SHA-256: c5288ee76c9c62d2c9a1ea1eb88afccf1788f6451ecb979eae35c2910526fed8
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many of which are hosted on disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the PDF and its embedded links align with common phishing lures designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ogcdc.org/uploads/ck_upload/files/zugasamawimobumakigofuzos.pdf In PDF document text
    • http://macabrey-luthier.fr/data/Files/86174057355.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/57170179437.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/rapizobuxabuwimitelipor.pdfIn PDF document text
    • http://101balkon.ru/upload/files/mekarib.pdfIn PDF document text
    • https://12tiga.com/contents/files/49510759740.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/jilinifexixutopunexodujak.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/39420478775.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/golutasivaka.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b82c5c5e13be417e4582fd45822afe55/31145633910.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/31023200076.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfe9fda14c---55020137108.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/zexifif.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/64923522736.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/13318481641.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/95383824528.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/49337018003.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/sixutisarudujajokipepit.pdfIn PDF document text
    • http://speckrepej.com/upload/file/74081883054.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/binoxiga.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/kigekusotugesokazoje.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/84360515573.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/99186009425.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/68160409327.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/zitemali.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/xakugozuwimoratowipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+hidden+call+recording+appPDF 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_off0000de1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 10844 bytes
SHA-256: 1428dd0552e069bc159a37ad8df377148124da05162c0f5e94f5caceedffeda0
font_01_sfnt_off0000f6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E2 18012 bytes
SHA-256: e56efa3e315688db6dd3d9f76a3dec3424d0054510810f45a58408e8d5883e78
font_02_sfnt_off00012533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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