Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5bc7b671085e3d…

MALICIOUS

PDF

49.6 KB Created: 2020-09-30 06:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c142d6f3377347b4b06ceabc3605a98c SHA-1: 6b584e098ffcb7a864a8fc341012ad7f568a44e4 SHA-256: 7c5bc7b671085e3dec47e7391e3b848408d0502b8af755a9b2d77078bd2a9872
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that mimic search results, directing users to a malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF was flagged for linking to known malicious infrastructure. The document body itself is heavily obfuscated but contains references to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?keyword=sociology+book+in+urdu+pdf+free+download In PDF document text
    • https://site-1037920.mozfiles.com/files/1037920/sonenasesadutejarotoxomo.pdfIn PDF document text
    • https://site-1037849.mozfiles.com/files/1037849/mosifapozewovabegofurem.pdfIn PDF document text
    • https://site-1036925.mozfiles.com/files/1036925/letonamurazixoxax.pdfIn PDF document text
    • http://files.azra-india.com/uploads/1/3/2/7/132740598/zaxevodanuxop.pdfIn PDF document text
    • http://tapoji.clarehungatehawk.com/uploads/1/3/1/8/131857315/simarozujuxope.pdfIn PDF document text
    • http://vusujaz.dragonshoardllc.com/uploads/1/3/0/7/130776485/dewamila.pdfIn PDF document text
    • http://files.giftsandgraphics.shop/uploads/1/3/0/7/130775866/9254721.pdfIn PDF document text
    • https://site-1036659.mozfiles.com/files/1036659/kazeganonibowiwu.pdfIn PDF document text
    • https://site-1037152.mozfiles.com/files/1037152/85558347420.pdfIn PDF document text
    • https://site-1036988.mozfiles.com/files/1036988/nekudo.pdfIn PDF document text
    • https://site-1037835.mozfiles.com/files/1037835/binilajuri.pdfIn PDF document text
    • https://site-1036884.mozfiles.com/files/1036884/dibozajokofufopofadu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/82811cd8-dfab-4502-8bbe-5cb2f657c80c/pavikoluligabatimemok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00df567f-cf71-44c8-8c1b-cc998c5cdca2/kokizowosezux.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://scripts.sil.org/OFLIn 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_off00005de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE6 5648 bytes
SHA-256: cd72c12825efcb73db7e72d88f98498d646c42ce5cabe08993a3159977d2b0cf
font_01_sfnt_off0000714b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x714B 9980 bytes
SHA-256: 2500148b77ee2e24caef27a4ceef155c5e4cf0c8cfceb4d422dc726e9f942847
font_02_sfnt_off000093a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93A3 22188 bytes
SHA-256: c4f1bf8e8215dc17b68e2482ce15617df4c87963d90c179834af4c07ae87a7c7

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