Malicious PDF — malware analysis report

Static analysis result for SHA-256 711e2c59a4b0bb45…

MALICIOUS

PDF

81.3 KB Created: 2020-12-21 11:02:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f6dffc8f82b31f5ad51319176cced933 SHA-1: 93edca0bcef4b654fa81a98235374b9eb1a3f4e1 SHA-256: 711e2c59a4b0bb45387b7a0b5acb45bc5910cffe90ac06d766727472c3ed4c8a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous external URLs suggests an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://trafffe.ru/strik?utm_term=mtn+secure+chat+apk PDF link annotation
    • https://bemogipe.weebly.com/uploads/1/3/4/3/134379528/29b10b4.pdfIn PDF document text
    • https://fopizute.weebly.com/uploads/1/3/4/3/134315067/3741102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467581/normal_5fba0e751c319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479906/normal_5fd2c66170813.pdfIn PDF document text
    • https://segakimorepej.weebly.com/uploads/1/3/0/7/130738797/kadudivisopuzugel.pdfIn PDF document text
    • https://direwuberegenis.weebly.com/uploads/1/3/4/3/134361890/c66bb7c423bce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390071/normal_5fb254716f506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482882/normal_5fb3c66030b6b.pdfIn PDF document text
    • https://zusaneji.weebly.com/uploads/1/3/0/8/130813769/8485170.pdfIn PDF document text
    • https://lajofezev.weebly.com/uploads/1/3/4/6/134603150/65167.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/5fdc7a3b0a190b16b315946c/t/5fdca85af31c0839905addff/1608296538907/87337660297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52bdebfd-62cc-4ffd-8bed-2ca2c99206b7/63255260310.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff9e5ed1-e86e-4f62-a61a-9133cea09d10/dasovumeno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e96d124-47b1-4c27-ab7c-b63de5ed4ebe/bio_medical_waste_management_2018.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6d43658762305c0f49b3f/t/5fd64c62ab777271768bc7a8/1607879779466/75436955829.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010a59.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10A59 25628 bytes
SHA-256: 45818aae21c5ffb70706d0f3d0afd5e737680c08e6ba2694010d636ae9ca02fc
font_00_sfnt_off0000ce86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE86 5056 bytes
SHA-256: 85187737b8c8ace8bfa347252dda8a133de71abba26f39981c130d4c24fcaa4c
font_01_sfnt_off0000dfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBE 13812 bytes
SHA-256: 698df5a3061a6e2f109c49c379b69e8e20a341dea534d67b1262720d3d233278

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