Malicious PDF — malware analysis report

Static analysis result for SHA-256 869e1dd07558c797…

MALICIOUS

PDF

72.7 KB Created: 2021-09-21 02:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 799a26d0856aea293b5ad5e6e9bc1953 SHA-1: 24124d5cddc764c174a8cb3fef5724fac3f4735b SHA-256: 869e1dd07558c79721ca8a4a63069a0ec0cf7122404f19c92910b12a2aebf551
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious. The presence of multiple distinct hosts and the 'utm_term_redirector' flag suggest an attempt to manipulate search engine results or redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 4

  • 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://0286869143.com/editor_images/files/nujof.pdf In PDF document text
    • http://mylodge-naoshima.com/images/blog/file/vedikom.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/30765451611.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/kizubimotikawazamebavobub.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/gedovevofinikipanifogar.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/xuvutabugexu.pdfIn PDF document text
    • http://chinazzjx.com/d/files/64241983334.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/20358191602.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/of538b43b6lqtlb826n381819e/mazowimedemowagevegujozid.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/gofadememalapedafobiba.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-19/20210919085339631152.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/vasixaxilupuni.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/jezirumijujol.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142777a764a8---pelevujogimetinog.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/lolatatuzuwejefojivil.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109031854388287.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/1843580010.pdfIn PDF document text
    • https://chilepools.com/contents/files/27303577685.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/gelesitag.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210912_050658.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/jojekusogedobowiwejeruwed.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/pametujefokarikaf.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/53843911130.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/71367683627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=uc+music+apk+downloadPDF 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_off0000ba7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD293 10632 bytes
SHA-256: 30c3816d8dfac9b63463f83019a9aaf844565dda4e3aacc1c21d7424ecb9f864
font_02_sfnt_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 16556 bytes
SHA-256: 6296ed89062652d6be949c7af42f2e7e8ae6eeb9286ba25371c1993fa8ad4849

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