Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eaa44987bc4adfd…

MALICIOUS

PDF

83.6 KB Created: 2021-05-29 17:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 26a6a7270bca52f11b5020d747abb5ea SHA-1: 80abcf604a910a1d8a047276a90013fa85513bc2 SHA-256: 4eaa44987bc4adfd131d12c81ea5a3edec08cf518b2cbcd26a5b2d1e28e59d85
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dafemum.ru/123?utm_term=tcc+com+abordagem+qualitativa+pdf PDF link annotation
    • https://pamibatofenowa.weebly.com/uploads/1/3/4/5/134525539/5970960.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499317/normal_5fe11fc553904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378599/normal_6044d9eeea42a.pdfIn PDF document text
    • https://xizuzumuk.weebly.com/uploads/1/3/2/6/132682261/9880077.pdfIn PDF document text
    • https://duveniwapawas.weebly.com/uploads/1/3/4/2/134265961/suruxudazuzifanome.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_600e67d3e32d5.pdfIn PDF document text
    • https://lekifusa.weebly.com/uploads/1/3/1/3/131382118/lurabab-kuromodosogute-witexosapeti-wudelebaji.pdfIn PDF document text
    • https://nenomoxemobare.weebly.com/uploads/1/3/6/0/136010140/zigepevexiv-zatamoxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393898/normal_5ff4a21817f02.pdfIn PDF document text
    • https://vakajufatig.weebly.com/uploads/1/3/5/3/135332685/fc094b.pdfIn PDF document text
    • https://wugisawenepo.weebly.com/uploads/1/3/4/7/134749509/00ae5.pdfIn PDF document text
    • https://bozixezexa.weebly.com/uploads/1/3/4/8/134861503/livegojexupawo.pdfIn PDF document text
    • https://tejukazirinari.weebly.com/uploads/1/3/1/3/131398521/dupiwutorepu.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/a175d94f-9fba-4946-bb93-0c18d6d6d4ba/kimesonatatewoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b304911-dd06-4f27-b85d-d3dfe4a96fe5/best_fake_gps_for_pokemon_go_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd1d98f-d689-4856-9334-a1f74def9949/felimulexutumafepov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1cdbcc-bdc9-4141-8193-e68e5bc855e2/jesadutoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60f53668-7cb7-4793-ae0c-290f3483cde7/popovazavudowasorutud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9faee45d-1e36-4639-9883-01df40f95620/advanced_algebra_writing_equations_of_transformations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8dc120d-6bc7-4d3d-b96e-3936ad77c62b/what_is_the_role_of_management_accounting_in_corporate_planning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d72e69b-15e1-4722-96ea-cf93fdd4b2c6/wopiminoketowegazor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45b3b914-1e9a-413e-91c2-a8590082e4ba/fodalomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a3b8f05-6121-4a78-ba8c-2896bb9d6ba3/zujutonokezusanubabivuziz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b49358c-e186-4031-b5d8-ed566eddc159/momivoresuwewewibe.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_off0000f032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 5572 bytes
SHA-256: 77ff20d1decc10fe56a9438f9ad97bf13a1061dc8047ee03c57e74db7edfbc7d
font_01_sfnt_off00010307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 12420 bytes
SHA-256: 49c728ca12cc2e1dd7a4d68227b12110ea67fb6487958c8ffd8b4464caa161a9
font_02_sfnt_off0001296a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296A 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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