Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c14b769c0300c5f…

MALICIOUS

PDF

34.6 KB Created: 2020-11-05 21:06:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: da4ad85e0bcd893ebefbe1a2820de2f4 SHA-1: 12ebe425a0c0e6733a6f5b5c4a92580f762c37d2 SHA-256: 3c14b769c0300c5f43c24ff46dea98f69ba1a75dce3e88654aa81ff21506efbb
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 1.0000

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://trafficel.ru/123?keyword=venture+company+business+plan+wow PDF link annotation
    • https://rirumuzog.weebly.com/uploads/1/3/4/1/134109041/52b51692.pdfIn PDF document text
    • https://nevijajemiwawo.weebly.com/uploads/1/3/4/3/134340376/luwiwejedejib-suxazezinobub-mowipag.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/nakuwureguwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_5f8cfade8e399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5f8d103c7d602.pdfIn PDF document text
    • https://tatunonomufobuf.weebly.com/uploads/1/3/4/3/134355176/tofetimurew.pdfIn PDF document text
    • https://boxolajabamofi.weebly.com/uploads/1/3/4/3/134356625/dagewo_seberif_kunej.pdfIn PDF document text
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/3607731.pdfIn PDF document text
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/83a6454.pdfIn PDF document text
    • https://valezofijamope.weebly.com/uploads/1/3/4/4/134445284/fe8c5dc8f.pdfIn PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/beff61179ba0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_5f8ccccdd7f70.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/memul/jitutomuzotademokuzojilun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4161/8082/files/boroxosizusiduvevokurozu.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_off00004add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4ADD 5380 bytes
SHA-256: 1dd83375498313aa07e41f20e29dbd5b36c2e6f504832617f213282d5507c28b
font_01_sfnt_off00005d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D22 9616 bytes
SHA-256: 9c962f7beafa2c07c2a6463aefd17bdf1f3f9af38b5b4d3c8b87d75a5043619b

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