Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc66188accd3a77d…

MALICIOUS

PDF

81.8 KB Created: 2020-11-11 23:49:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 4305f18c68fac738d5f1b6a06430af94 SHA-1: d83a0bdd8654b00e1ab0a8332da563566deea176 SHA-256: dc66188accd3a77d1c3797882203b3a25478be671d8efea0b5a367f3f32a4fe3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafffi.ru/strik?utm_term=twins+of+the+pasture+cg PDF link annotation
    • https://vabejodero.weebly.com/uploads/1/3/4/3/134378136/sibusotu-mavifififelo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457881/normal_5fa430a2db4ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448096/normal_5fa5a9fa81710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393181/normal_5f904e85b728b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465255/normal_5fa4650e55bcd.pdfIn PDF document text
    • https://fugubujezowegi.weebly.com/uploads/1/3/4/5/134502495/6c1fe63.pdfIn PDF document text
    • http://picfs.com/192epqIn 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/322d6ce6-488f-4f94-b777-11fa240fc3ad/melagizizovusezonaru.pdfIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/rusewovuvozejutafug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deb12a74-cce9-47ca-ba9d-633d931dc86f/marauders_map_printable_a4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b63a4ab-a2b0-47e2-981a-d80b0bccf81d/10032417411.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/qrz_lookup_callsign_database_arrl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a70bc25d-14eb-4ed9-8e32-877e23431f3b/48655320449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55b37715-e599-49fe-adad-4589ec87b4c2/2017_honda_accord_touring_v6_sedan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47e3b113-1a75-4df2-8f24-812107e688b3/jivaxumakoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/426f9fd1-f90b-4974-94ff-7a567996e006/nudadegatomonita.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_off0000d118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD118 15328 bytes
SHA-256: 804a52a100e0fc7df80f1ef21673db9acf52a606deab283531a9a60ad2b82096
font_01_sfnt_off00010236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10236 5284 bytes
SHA-256: da0327623444d954b13e194838e7640d8fd0b3d7f002b8d3caae2dc60fe49d24
font_02_sfnt_off00011443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11443 11028 bytes
SHA-256: 9b547a0d6c067b203746300baaf811ba9bbe664aa5837b7a2e50d799043a9dc7

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