Malicious PDF — malware analysis report

Static analysis result for SHA-256 a879f13a9a4ae3bc…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 07:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 366e338fc896d2e9f9dfb5649337b9a7 SHA-1: e946328d7f04f8be0cfa711e8145a588f0b14b91 SHA-256: a879f13a9a4ae3bcdaba4ca85ec5d68e7d7e585f456a74836e1b2f8729674c99
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous external URLs, many of which are embedded within the PDF structure, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of hosting many links on disposable domains, a common tactic for phishing or malware distribution. No scripts were extracted, but the overall structure and heuristics point to a malicious intent to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=life+cycle+of+eagle+bird PDF link annotation
    • http://wonderful-foods.net/userfiles/file/berepewunorif.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/57805686713.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/muditemugodam.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/55436314805.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/50535915390.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/92971964877.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/69599283682.pdfIn PDF document text
    • http://aasghsflqsae.handylover.com/upload/files/zobetapafup.pdfIn PDF document text
    • http://irinabailey.com/upload/files/71858501021.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/pazibekusu.pdfIn PDF document text
    • http://cssh.es/img/file/46793204468.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/gibibaj.pdfIn PDF document text
    • http://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/59788024922.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/kixetasi.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/76598050302.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/gabixuranefab.pdfIn PDF document text
    • http://temple.mo/userfiles/file/xujaxomaninabesopel.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/32596970984.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/manivabuwelobexun.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/26740610654.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__612F57BFBFDD8.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/sikopugowajiwumidozavilak.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/kowadetir.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/duzitanufotof.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/tijilubejuketepuset.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_off0000b3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC00 16548 bytes
SHA-256: bf72ac18bf52c85cdac7e1df97ae6cbb1120854aef532e9092f289ae2827d85a
font_02_sfnt_off0000f5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F7 10492 bytes
SHA-256: 6bb43812068accfa9caa651b6448c251d4739f668d85d401c27a1c417417052c

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