Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae255963369cc8f…

MALICIOUS

PDF

62.2 KB Created: 2020-11-24 18:52:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4701fa43ee66b5bc87fe53069ffc6840 SHA-1: d838d75dc4ee48f0b53dfe07a979fd2d96019c84 SHA-256: cae255963369cc8f39c84eb19d672a98169dd18df2c307da858007ac677e88e3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicative of a link farm designed to manipulate search engine results or direct users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially harmful content.

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://traffine.ru/aws?utm_term=asus+rog+aura+core
    • https://cdn-cms.f-static.net/uploads/4367923/normal_5f8a0516cabca.pdf
    • https://sawalodisixujig.weebly.com/uploads/1/3/4/4/134490012/firabuwazovoke.pdf
    • https://cdn-cms.f-static.net/uploads/4462075/normal_5fa84e65aa725.pdf
    • https://munujagafunudo.weebly.com/uploads/1/3/0/8/130873736/risugemojanolu.pdf
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/8697108.pdf
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/bupemigimamuvap.pdf
    • https://paxesejok.weebly.com/uploads/1/3/4/3/134348383/c4a87dd679094.pdf
    • https://cdn-cms.f-static.net/uploads/4388041/normal_5f95b5eb479d2.pdf
    • https://cdn-cms.f-static.net/uploads/4458840/normal_5fad2a952fac4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ragejufa/94256751554.pdf
    • https://uploads.strikinglycdn.com/files/7b5bf2c4-3d51-4b2e-aee5-b62874270fe6/zurajifamujesiwasanuwede.pdf
    • https://s3.amazonaws.com/penale/ielts_writing_task_1_samples_with_answers.pdf
    • https://s3.amazonaws.com/jajoxulabojaso/duik_16_guide.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_off0000b803.bin
bf99054bdc3505f787be01cc16e0833bb4ab782720ee8f2517437cc9b7d7524c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB803 4924 bytes
font_01_sfnt_off0000c8d1.bin
55cceb57e726ecc1baec2c70225d34d7165ee365866913f38e247c7efa35d248
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D1 10464 bytes