Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fbf1b02e601e600…

MALICIOUS

PDF

73.4 KB Created: 2021-06-06 19:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9bfbbd53a12755129d76e64cb60ef109 SHA-1: 4b2b81c6c85baeab1e4b13452f6815974b1d5e35 SHA-256: 9fbf1b02e601e600d8ce08c2ab6d70b81fcd77cc25bdd5382d02e053696eb6ee
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs point towards an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://wastran.ru/pbw?utm_term=is+archer+farms+turkey+breast+gluten+free PDF link annotation
    • https://wifirinopemuv.weebly.com/uploads/1/3/4/7/134762260/de9b7122a557f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406806/normal_6006be11cdb06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460966/normal_602462fa475f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423752/normal_60488cc39834d.pdfIn PDF document text
    • https://kajovagej.weebly.com/uploads/1/3/4/7/134747054/5635656.pdfIn PDF document text
    • https://nugekiva.weebly.com/uploads/1/3/5/3/135322430/dolisetedit-rerebejedug-dolife-mawonif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385852/normal_5fcf358490bb3.pdfIn PDF document text
    • https://duwesokele.weebly.com/uploads/1/3/1/6/131606866/54a3d3c69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477630/normal_5fe88345e174f.pdfIn PDF document text
    • https://bumewotosebixab.weebly.com/uploads/1/3/5/2/135298585/givasis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380382/normal_5fffb2e56b289.pdfIn PDF document text
    • https://kisisegexorev.weebly.com/uploads/1/3/2/3/132302984/d4030cbde13014d.pdfIn PDF document text
    • https://lesapexif.weebly.com/uploads/1/3/1/6/131637780/cd274.pdfIn PDF document text
    • https://somanenor.weebly.com/uploads/1/3/4/4/134472611/keletebewale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505358/normal_6050717853401.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sipibujewadu.pbworks.com/w/file/fetch/144498363/46166983007.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144416232/61307679533.pdfIn PDF document text
    • http://jizakatum.pbworks.com/f/grow_taller_after_puberty_free_download.pdfIn PDF document text
    • http://wojipag.pbworks.com/f/nogizukegupojakep.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/w/file/fetch/144522321/38361133217.pdfIn PDF document text
    • http://pigedigasexu.pbworks.com/w/file/fetch/144573912/juguvanomojatapitexenizi.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_off0000e051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE051 5540 bytes
SHA-256: 93276bf89c9571a189ae4c18b935bafeb00b135a6ddcc9d1f06c19eb91e26fda
font_01_sfnt_off0000f309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 10884 bytes
SHA-256: 3e7aad5429c8c2ed38611f897ee3605164e2f0673fd642389b6bf21033bc0f28