Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a573314dc7c422…

MALICIOUS

PDF

79.7 KB Created: 2021-03-16 03:14:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f64c388ebe671e8a27fd9c79a47b15a1 SHA-1: b1d1d99fe1ff7af9f0f4a45d6b8d2e620eaa7618 SHA-256: 64a573314dc7c4224728217129489da7fe1e346c3561c6fca48f2d233f1778ca
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/wix?keyword=the+solar+system+and+beyond+worksheet+answers PDF link annotation
    • http://vipadobotisituz.mygamesonline.org/pevib.pdfIn PDF document text
    • http://xilexevu.scienceontheweb.net/38431452052.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369187/normal_5ffa4da99a4a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474448/normal_5febeb2d6750a.pdfIn PDF document text
    • http://gopidap.scienceontheweb.net/three_phase_boost_pfc_converter.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458623/normal_5fe334cbec07a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450890/normal_5ffd47d77ad4c.pdfIn PDF document text
    • http://jotitojimo.mygamesonline.org/akreditasi_puskesmas_bab_6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://widifusi.myartsonline.com/mathematical_constants_finch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c26056b-3359-471d-935d-f11ad959c723/9815170381.pdfIn PDF document text
    • https://36d3fe4d-ce77-4ecd-ae21-04b42370c250.filesusr.com/ugd/871c54_2358159596d141a2967dc4b771d942ca.pdf?index=trueIn PDF document text
    • http://rulamiji.onlinewebshop.net/nezuriruxavuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/338eb9c9-36ca-48bd-ae10-9dace9be04cd/93598093910.pdfIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_56bbb5170d7449a580d40a9bdc740ffe.pdf?index=trueIn PDF document text
    • https://2efabd41-1f95-43d0-8245-5f8eb9267247.filesusr.com/ugd/2f4ddf_b33e4a3bdf0d4c21acfd927d03dd3b4d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e57737d-64cb-4d24-80dc-057a6e4a326a/words_that_start_with_ona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf000432-c07f-4a54-a0e0-2e9b4e859a65/76130191223.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/019112d8-8c6a-4c0c-84d3-498803b7db84/gexad.pdfIn PDF document text
    • http://fusozevukatamir.atwebpages.com/dalakujotovodefibome.pdfIn PDF document text
    • http://nabulegewuwal.myartsonline.com/scag_wildcat_parts_list.pdfIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_9613057828a346b2a60d1764f1e9354f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e80d2fd7-e3c9-40bc-b15b-dc4498b88087/titus_andronicus_film_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fc3181f-56ef-47a2-992f-d07503899a2b/85596761012.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0E 5152 bytes
SHA-256: 154ce4960565bf4cecdd8e8ff8eb7b58a3307a52d3c7f08915bb1c7854968bbb
font_01_sfnt_off0000fc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 10796 bytes
SHA-256: daa1aee2b05e5896de2b04c177f7cd82793ecf7bbcfaacab53f09f399bc8a9ad
font_02_sfnt_off00012130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12130 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3