Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88f88000a8cd1c1…

MALICIOUS

PDF

95.9 KB Created: 2021-05-28 19:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 73122f3218cd5a2589686b027c6f32c4 SHA-1: 1b75b466525460ccc3620c2edb56d4bfe27bb810 SHA-256: a88f88000a8cd1c18abeb19a81c405180deab1032c224f3844083f83affa3e83
156 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 0.9996

Heuristics 5

  • 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.
  • 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://crophysi.ru/strik?utm_term=plan+municipal+de+desarrollo+urbano+cuautitlan+izcalli+2019 PDF link annotation
    • https://vixugusimuxomuj.weebly.com/uploads/1/3/0/9/130969476/363857d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493589/normal_5fdbc3a7e52cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380694/normal_6052e51da9e58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373985/normal_6038ddd70158c.pdfIn PDF document text
    • https://xinagele.weebly.com/uploads/1/3/4/7/134729321/rubawi-bevugub-gamun-fogoketo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_6027d2dcb44f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453342/normal_60007802c356b.pdfIn PDF document text
    • https://dewotime.weebly.com/uploads/1/3/1/6/131606762/xatot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485450/normal_6047f5b37d6b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378843/normal_5fe1ea33267c1.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/8108bf83-94c8-4b28-a3f4-69d7272358bf/9944978866.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bec5b86-f7ce-483e-9222-29150796e37b/6467512773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8524616-24a7-4d78-a2ce-8feb8f7d1e4c/pewebatirawinosusow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e72491b-620f-4710-a3fe-3d96db88e90f/criminal_law_notes_llb_part_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e38c3de0-3263-4720-b62e-a8a6ed604140/38497599429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5b4dcdb-e399-4484-90c2-b892fded7f6b/importancia_del_estudio_del_derecho_romano_en_la_actualidad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74161373-634e-4924-aa5b-924d9f7d0750/54140767353.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5ff016b-766c-4bc7-bd95-4aaec3be39d0/penuzapevakazolapativape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e133e474-5390-4aeb-9ee6-bb8c05a5b09e/1158534965.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5b4ea64-13f6-4c02-bb99-b07614d539e0/annabel_lee_poem_theme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46de8612-cb80-44ce-a57d-e8bab82e8026/16608956686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb96feb6-5891-44b9-a169-b1df4b6fa2e4/ruvijevuxabegitunopuw.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_off000131d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D7 5892 bytes
SHA-256: ec6760fa085bc03c8d1a702c1d6c225e512fdb50477349a32c5eb771515625ae
font_01_sfnt_off000145ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CA 12976 bytes
SHA-256: 85bcd779f73ff7d965976f43a68ed14fb8884ba0c55984600610ce9bf73fb8de