Malicious PDF — malware analysis report

Static analysis result for SHA-256 0725cb38c440f8e0…

MALICIOUS

PDF

40.7 KB Created: 2020-10-07 06:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e11fd2e36e8c1c55b6ed6367c923840c SHA-1: 7770bcd06e85b5f4435aa1a11068f8b38f30211c SHA-256: 0725cb38c440f8e058b241ff18ba22c9d348d010f4675091a621ff07751c6f28
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that point to a known malicious redirector, suggesting an attempt to lure users to malicious content. The document body, though heavily obfuscated, contains the same malicious URL. The PDF also functions as a link farm on disposable hosting, further indicating malicious intent.

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://ggtraff.ru/strik?keyword=advanced+microeconomic+theory+jehle In PDF document text
    • http://nijomipuj.ottersideanimalhospital.com/uploads/1/3/1/6/131636725/dapalugimo.pdfIn PDF document text
    • http://files.stevebtowers.com/uploads/1/3/1/4/131437402/b2a342fbb184d39.pdfIn PDF document text
    • https://site-1039209.mozfiles.com/files/1039209/nedofumiboxuwibebavob.pdfIn PDF document text
    • https://site-1040132.mozfiles.com/files/1040132/87468692658.pdfIn PDF document text
    • https://site-1036828.mozfiles.com/files/1036828/16300940835.pdfIn PDF document text
    • https://site-1039992.mozfiles.com/files/1039992/56900438471.pdfIn PDF document text
    • https://site-1038670.mozfiles.com/files/1038670/48696711025.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/7a55ac7c-b413-4cc7-ae63-1d7697f6ffae/pajejogibagixivusagitopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d28b852e-f16e-492c-b9f9-11b1b27c6c87/44231419262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/468c97fd-42e4-4fd9-9e4d-220cfb22a653/gazupaxuma.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7883/4586/files/oreilly_auto_parts_delivery_driver_salary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1024/4260/files/digarosesekewosug.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_off00006205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6205 5228 bytes
SHA-256: 1678c36eac09d8ef0ef6d84567530564dab61bbfb8d553d47602edb3364dc402
font_01_sfnt_off000073b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73B4 10128 bytes
SHA-256: 875a1d5df7dd031e98762bdb0d56141335fda9957f85b8877df2636f0064427c

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