Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba06aa75c1a8259e…

MALICIOUS

PDF

74.7 KB Created: 2020-11-20 10:22:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08851c1dbb20b2a6d2b0f14436c7c5d7 SHA-1: d4e87d2a4d8eee4499660874640da8b84ce9f43b SHA-256: ba06aa75c1a8259e779ff5cff838ba205d5b4ebefa080a0b4d136a34105f9cdd
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a link farm containing 30 external links. The ML classifier also strongly indicated maliciousness. The presence of numerous external URLs, many hosted on Weebly and S3, suggests an attempt to direct users to potentially malicious or SEO-abused content. No scripts were extracted, but the PDF structure itself is indicative of a phishing or link-farming lure.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/123?utm_term=transverse+costal+facet+define
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/tinimuw.pdf
    • https://cdn-cms.f-static.net/uploads/4388420/normal_5f9573bd792f7.pdf
    • https://cdn-cms.f-static.net/uploads/4401505/normal_5fad119862001.pdf
    • https://dilenobepaw.weebly.com/uploads/1/3/4/6/134662491/nosunoguf_xudan_kojizibagili_tunevojobubiwat.pdf
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/gebizuv.pdf
    • https://xoselupovogim.weebly.com/uploads/1/3/4/6/134610719/povedemotirefira.pdf
    • https://vinazawodix.weebly.com/uploads/1/3/4/3/134352366/62f33c2.pdf
    • https://cdn-cms.f-static.net/uploads/4368949/normal_5f9ec3ebed87b.pdf
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5f8763b693892.pdf
    • https://cdn-cms.f-static.net/uploads/4381551/normal_5fa097ae27c67.pdf
    • https://cdn-cms.f-static.net/uploads/4368747/normal_5f8cb42ad51e5.pdf
    • https://cdn-cms.f-static.net/uploads/4388814/normal_5fa105dc3fa30.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nerugiraxura/free_confidentiality_agreement_template_south_africa.pdf
    • https://s3.amazonaws.com/firigugixujotov/words_with_anti_prefix.pdf
    • https://s3.amazonaws.com/xipavir/72361560073.pdf
    • https://uploads.strikinglycdn.com/files/adfeacf3-80a2-4335-98dc-cda8947b4ba2/everyday_writer_5th_edition.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f0.bin
aa04d910eed0bde406e7ca16250b77e69ee32a7a2a131f4c1ed56f5aa6777b93
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F0 5024 bytes
font_01_sfnt_off0000f518.bin
3e7f5b1d235adfcff959c70e1dedac8d34db647fbcc9b5d1e7f4449105d516c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 12072 bytes