Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4865f7001c22679…

MALICIOUS

PDF

44.2 KB Created: 2020-10-13 06:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 068bb3915c5eb4aa78b260c21d1ec217 SHA-1: dcda0dd457aa26739ff539ab55a9ec82b11c7661 SHA-256: f4865f7001c22679ecf0250756164a3c258a52f04cebd8fdb672873a229b9367
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains URLs that are part of a link farm hosted on disposable domains, suggesting a phishing or redirection attempt. No scripts were extracted, but the presence of malicious links is sufficient to classify this as a phishing attack.

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=rccg+sunday+school+manual+october+2020 In PDF document text
    • https://site-1038998.mozfiles.com/files/1038998/1548266119.pdfIn PDF document text
    • https://site-1036644.mozfiles.com/files/1036644/jepigos.pdfIn PDF document text
    • https://site-1037885.mozfiles.com/files/1037885/pefufap.pdfIn PDF document text
    • https://site-1036734.mozfiles.com/files/1036734/rebarupi.pdfIn PDF document text
    • https://site-1040885.mozfiles.com/files/1040885/dubiwiropebewobesukiforur.pdfIn PDF document text
    • https://site-1036640.mozfiles.com/files/1036640/79808368748.pdfIn PDF document text
    • https://site-1038558.mozfiles.com/files/1038558/xuvoxejukom.pdfIn PDF document text
    • http://gukopenuj.aliciavilas.com/uploads/1/3/0/7/130739227/7044603.pdfIn PDF document text
    • http://lexikin.whitenergroup.biz/uploads/1/3/1/3/131383652/5830031.pdfIn PDF document text
    • http://files.primroselane.com/uploads/1/3/0/8/130814100/vijeduv.pdfIn PDF document text
    • http://files.camwenrich.com/uploads/1/3/1/4/131438616/geruguka-wejowog-lefoposokuduvov-mabifegamale.pdfIn PDF document text
    • http://files.westboundgermanshepherds.com/uploads/1/3/1/3/131397970/bobekalutinuduw_burimati_taxemugapobafo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0360/8214/files/bob_howard_nissan_service_coupons.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3097/3080/files/47899346147.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8588/1759/files/kotor_2_cheats_pc_not_working.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D0A 5876 bytes
SHA-256: 58650580c40b3c2a95570e3543269fc03ec4d7f51732ad4fb99a9df6c414ffd9
font_01_sfnt_off000080e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80E4 10276 bytes
SHA-256: 0b6d2ffe569bb9cd5d7138c1371555ce45f751d07afe610e921a7517e8704fc4

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