Malicious PDF — malware analysis report

Static analysis result for SHA-256 603378bf3832ba54…

MALICIOUS

PDF

59.0 KB Created: 2020-11-14 02:03:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0b655101bde2af90ab6e78c7a7dca23 SHA-1: b63cd7e32624b5cd63b340288fbb2b20fdb48e97 SHA-256: 603378bf3832ba54b6af48f64228774dc9fa20ec1782993ac40fd66020606394
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets and Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no explicit script was found, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/aws?utm_term=case+files+cardiology+pdf+free
    • https://tazejoga.weebly.com/uploads/1/3/1/3/131383942/1094182.pdf
    • https://xeveguxugagu.weebly.com/uploads/1/3/4/6/134600238/biruluxuxujoson-zevevep-ranelipazu-jonef.pdf
    • https://cdn-cms.f-static.net/uploads/4427079/normal_5fa169ddd6274.pdf
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/lovovukibejuvomuzagu.pdf
    • https://cdn-cms.f-static.net/uploads/4370303/normal_5f8be79739417.pdf
    • https://zavomafig.weebly.com/uploads/1/3/4/3/134356936/zorewotobanop.pdf
    • https://cdn-cms.f-static.net/uploads/4368238/normal_5f8cfdfec813a.pdf
    • https://cdn-cms.f-static.net/uploads/4413454/normal_5f9d31bb371f6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pukasojalu/dejodoxixosekixaborefaf.pdf
    • https://s3.amazonaws.com/jinabom/26057961421.pdf
    • https://s3.amazonaws.com/zikeko/reorder_pages_in_file.pdf
    • https://uploads.strikinglycdn.com/files/85883362-1e61-4eea-bf02-9a9fd0acf3d4/44054629476.pdf
    • https://s3.amazonaws.com/tobito/vadudekuba.pdf
    • https://uploads.strikinglycdn.com/files/3e550968-833e-40d5-bd1d-7ccca0eaeb52/2360839469.pdf
    • https://s3.amazonaws.com/gowebabuxogiro/cartii_de_apicultura.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_off0000a9ea.bin
dc11889e712148fec7d06a3c5f9e9a54346d84a436d41902b4d1221b39403790
pdf-font-stream PDF embedded font (sfnt) at offset 0xA9EA 5328 bytes
font_01_sfnt_off0000bc1f.bin
00013e46db0f570841f6203f9ed609d2450ca9e438fcd46f12afe44b6d8d791f
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC1F 10272 bytes