Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f5fe2d373a5dac…

MALICIOUS

PDF

76.0 KB Created: 2021-02-16 23:35:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f97ac06924a275749a926d4e1d02c26c SHA-1: 133bd21cfea6bd097ccb2e05cf35c1c5911621d1 SHA-256: e5f5fe2d373a5dacb72cc4a63bebdf2951f0b75d28541c2b6bb397fe87649561
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The presence of a critical heuristic for PDF SEO link farm and ClamAV detection as Pdf.Phishing.Trojan indicates a malicious intent to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic strongly suggest an attempt to deliver a malicious payload or phish for information.

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://baarspo.ru/wix?keyword=ge+dishwasher+service+manual
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/9288338777df.pdf
    • https://wekexodaxax.weebly.com/uploads/1/3/4/7/134713384/vorivebagumetogize.pdf
    • https://tuwebuliwarukor.weebly.com/uploads/1/3/5/4/135400964/morekeraxelo.pdf
    • https://refugisedenofa.weebly.com/uploads/1/3/1/3/131380322/papuvesudewivipixaj.pdf
    • https://wipowoniwosixad.weebly.com/uploads/1/3/0/7/130740259/wotolamorumujo.pdf
    • http://nnorm-id.com/ritaluvuvuxedabiwerniqu2.pdf
    • https://rukuzidin.weebly.com/uploads/1/3/4/5/134517246/tozezagowijun.pdf
    • https://kosonijuzar.weebly.com/uploads/1/3/5/9/135974682/560d85c5e974.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kiremefegonar/82213499823.pdf
    • http://madulok.epizy.com/usfda_guidelines_for_process_validation.pdf
    • https://s3.amazonaws.com/mosezavor/56304611439.pdf
    • https://s3.amazonaws.com/sesijesule/bts_guidelines_bronchiectasis_2019.pdf
    • https://s3.amazonaws.com/wovedukevikov/zazuwefupufo.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_off0000ec31.bin
9b050c2c8e65c128a7e0981a12d1354f0a430852a4a543a0d2e305363d515a3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 5364 bytes
font_01_sfnt_off0000fe5c.bin
6c070a762c989d12f68c944cc3a546cefa9da98ba4f40181d29770abfaa4821a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5C 10656 bytes