Malicious PDF — malware analysis report

Static analysis result for SHA-256 354daebd732491ee…

MALICIOUS

PDF

77.9 KB Created: 2021-04-01 07:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: bb1adcf85c9f64090ce80eac992695f4 SHA-1: a53f92a3f2f50c0d3f25e92fcf58ee56f794d9c4 SHA-256: 354daebd732491ee1e1c900d773e56f1923df8ca8d7b91f43c906a2ac7ef62c1
246 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for brand-impersonation credential phishing and a ClamAV detection. The document contains a mass of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the ML classifier output further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://pawonojureva.weebly.com/uploads/1/3/4/5/134522231/2633585.pdf.
  • 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://botokaw.ru/wix?keyword=official+gre+super+power+pack+pdf+free PDF link annotation
    • https://pawonojureva.weebly.com/uploads/1/3/4/5/134522231/2633585.pdfIn PDF document text
    • http://woxagaxizi.22web.org/nurezufezuxuvijepaz.pdfIn PDF document text
    • http://phrensy.co/wulerajipofedubupinowakgpvmz.pdfIn PDF document text
    • https://basotode.weebly.com/uploads/1/3/4/6/134691624/mawipokuv.pdfIn PDF document text
    • https://bedaruwi.weebly.com/uploads/1/3/5/3/135326402/6db829d.pdfIn PDF document text
    • https://manujemupofux.weebly.com/uploads/1/3/0/7/130738512/zanujub.pdfIn PDF document text
    • https://lupupoxapupep.weebly.com/uploads/1/3/4/4/134493602/jurusobibu.pdfIn PDF document text
    • http://xodulik.66ghz.com/eramet_sa_annual_report.pdfIn PDF document text
    • https://wosutazewaxutu.weebly.com/uploads/1/3/0/7/130775331/lavepakef.pdfIn PDF document text
    • https://memelixuluxowi.weebly.com/uploads/1/3/5/9/135958522/1458510.pdfIn PDF document text
    • https://lovelutunaguj.weebly.com/uploads/1/3/4/7/134735325/xiwudokupesejolarof.pdfIn PDF document text
    • https://duzofonateras.weebly.com/uploads/1/3/4/4/134494902/8c11f.pdfIn PDF document text
    • http://cuzinfo.ru/wikojot1asb.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_91f8f6e9f7a04f769f28c124a0a1b240.pdf?index=trueIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_123060d60c364e419bff3b2f64ca9014.pdf?index=trueIn PDF document text
    • http://viropamel.rf.gd/starting_strength_program_excel_kg.pdfIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_3354442fdede4317acb19274f2040dd8.pdf?index=trueIn PDF document text
    • https://37cc4ef3-276f-49d0-84f3-8bc08bbde6a9.filesusr.com/ugd/e4a5d4_acce458f68b9452eb891ba02d2f69365.pdf?index=trueIn PDF document text
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_f5eb5285968148aba3ba0d0cc1d47787.pdf?index=trueIn PDF document text
    • http://jojemoditupu.rf.gd/74411697052.pdfIn PDF document text
    • http://xinozotaga.rf.gd/how_much_does_it_cost_to_fix_a_rolex_band.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE634 1804 bytes
SHA-256: 8162cd4e9607bedc41987152db9172675b579470e8e212729d5a5ff14a53fde7
font_01_sfnt_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 5504 bytes
SHA-256: 3c1f3abe0fec9fdb092791a5be89ba22fd8414d9f8cbe244a73c6d620c468334
font_02_sfnt_off000101ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EE 11188 bytes
SHA-256: aaee0035f837be760aeb27aa7025ef67c382379c986963e9ccfc199203e7b552

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