Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f16fa5bc93a3786…

MALICIOUS

PDF

74.7 KB Created: 2021-09-20 22:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 93169af6c2194f625cbf174bc8a938b2 SHA-1: 04b711f6ee6df453b0cc8f7d781f6a12f5597417 SHA-256: 4f16fa5bc93a37867f288e78f2398bb04691177516201257ac2023ae821b415e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to other PDF files, indicating a link farm designed to obscure the ultimate destination. Heuristics suggest this is a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely leading to further compromise.

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 https://sapsda.com/SapmaUserfiles/file/11867435208.pdf In PDF document text
    • http://dongphat.net/upload/files/nupelejuf.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/ladawunigetasum.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/kinujuva.pdfIn PDF document text
    • http://inbond-cn.com/userfiles/file/71448857768.pdfIn PDF document text
    • http://irollee.com/userfiles/file/81812819453.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/92586853624.pdfIn PDF document text
    • http://exima.kr/userData/board/file/sagajagufoxadalivekere.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/sewus.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/1619557424.pdfIn PDF document text
    • http://csp.hu/editor_up/97747149130.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/c72fa67a5a51413c522c2c5b744f78f2/5399490999.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/rimaxefima.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/bezejedatinewajuwafo.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/ruxusewogikovosinidudo.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/32240871735.pdfIn PDF document text
    • http://mlight.cz/archiv/file/36446359352.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/71493870832.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ad26e32cc6ebbfb02269f427aa05e272/nuzenanitaxewoxef.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/fokuvofobazokele.pdfIn PDF document text
    • http://mfcpavpos.ru/file/godakuladamepisel.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/67968699086.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/gogomosuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=telegram+connecting+iphonePDF 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_off0000c07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC07A 10616 bytes
SHA-256: cd4f79651305db7ad324eb9fb3a020e9f878d9d970f9f042f93c0be4e4522f75
font_01_sfnt_off0000d887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 17156 bytes
SHA-256: 80314e0eb44a12362598f0f758604985a816b3d679a17310d63a2410ccb4a223

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