Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c131a060e27b6c9…

MALICIOUS

PDF

75.6 KB Created: 2021-03-19 19:28:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 3d1e1827759dd33260422b8f7b7f15b2 SHA-1: 92478773a3550e38d268ae709403777c25525b84 SHA-256: 4c131a060e27b6c94e9f212e6fbdac2d16ad5c2d3688d6a253a0a9e316e3a64b
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the primary URLs identified is https://jumiwimov.ru/wix?keyword=gameboy+cartridge+screwdriver, which is likely part of a phishing or scam operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/wix?keyword=gameboy+cartridge+screwdriver PDF link annotation
    • https://pofitokibifezaf.weebly.com/uploads/1/3/5/3/135394855/zutageroganob-govawifemegafuz-simivuje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454821/normal_5fee6377da5c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497078/normal_604056e7372d5.pdfIn PDF document text
    • https://metifipiwe.weebly.com/uploads/1/3/1/1/131164131/6a8ef692709806b.pdfIn PDF document text
    • http://numulul.mygamesonline.org/2004865511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465151/normal_6031819b810cd.pdfIn PDF document text
    • https://jeburetuzof.weebly.com/uploads/1/3/4/3/134306955/ceccb67a332d.pdfIn PDF document text
    • http://zokupez.mygamesonline.org/14901694229.pdfIn PDF document text
    • http://kubosikavudux.mygamesonline.org/healthrider_h20t_treadmill_price.pdfIn PDF document text
    • https://wuxavuzipirugud.weebly.com/uploads/1/3/4/0/134012349/devobepelim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_e2cb702aa05944e294c569c84bbd9e02.pdf?index=trueIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_c49937385f124834b1d6c55df9c1df6e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/2463230791.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/roomba_960_review_carpet.pdfIn PDF document text
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_e1e4598e51344278a49659b824b9dd00.pdf?index=trueIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_abdaf15b1b9549f1836e9c1b2ccb729d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/75052243683.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_4ce6b0a90bbd4c5bb332f3942874ba26.pdf?index=trueIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_59f6252c12e749a0aa26aab48e780a4a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/netepobokufefovojilamov.pdfIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_dee07b0d8d93444d8da6854dffee23b6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/subtracting_fractions_worksheets_free.pdfIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_8e6683f0a2fd4a30a54c721e9c5d0868.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA27 5652 bytes
SHA-256: 67b78ed4ac325cf23ede42d2d8edbce70b772c2fd53c8c7d0d761cc2c33624ba
font_01_sfnt_off0000fd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 10404 bytes
SHA-256: 05f680fefc530702e328af31683a38a093099bd36fbc173094ab86f786be5962