Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e5a44fe5b548d7…

MALICIOUS

PDF

87.8 KB Created: 2020-12-15 20:23:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 99a323a6cd7ff26f7a27aa108cce533a SHA-1: e138280480f202e8ca1d7be73ebe6b6f43512396 SHA-256: e1e5a44fe5b548d74f9376c9b3489b93d47def2dd96eaee86aa4c401fa1dcaf1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, a technique often used in SEO poisoning or link farm attacks to drive traffic to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs suggest a redirection to potentially malicious content or phishing pages.

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/123?utm_term=en+espanol+unidad+1+etapa+2+answers PDF link annotation
    • https://pemopexo.weebly.com/uploads/1/3/4/3/134305592/nowimi_tukegata.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_5fa3e4aee12fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483855/normal_5faea9d5df6eb.pdfIn PDF document text
    • https://julupovopanar.weebly.com/uploads/1/3/4/7/134732987/kowuzele.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5ba12df132613bbde966f/t/5fd136e34cd2f405fd5caa87/1607546596126/18728106455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3100dd13-40ef-4479-98bf-6ae433261985/iupac_periodic_table_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/78438101716.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/chemical_kinetics_class_12_cbse_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fecb507-c726-485a-b844-1a1e6d922fa0/56455431703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec4eda77-ebe9-4e79-b075-8617dd9632ab/2001_ap_psychology_free_response_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb3fc980-edb6-46e9-b174-0a713e4f73e6/95852430593.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/luxumekekavakovizorus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c549a2d-99bd-4278-9d6a-dbd1fab389fe/how_to_build_a_dog_runner.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_off0001140c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140C 5184 bytes
SHA-256: 57b2384552afb30747fef41d5d733cd1f9dd02a14efc1b33dd727e22ba8e5208
font_01_sfnt_off000125d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D3 13540 bytes
SHA-256: 187ccff328fd87189d9d9e288c4405a0ad2be8b05ba4286a74a6a89eaa6d4cb0

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