Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae73cdf352d9602…

MALICIOUS

PDF

81.9 KB Created: 2021-02-20 02:44:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bee46fa5b9936ffe4d3729ea037c9bcb SHA-1: b71492e1b38173553526cb06f1ca961554ac778d SHA-256: 7ae73cdf352d96024ab4b39de957fa8fb290601b242cbf61a7c47befdf531075
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and services like Weebly, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=books+like+the+way+things+work PDF link annotation
    • https://zorisurirumu.weebly.com/uploads/1/3/4/6/134600588/nujen_luduf.pdfIn PDF document text
    • http://barojenixumaja.iblogger.org/wikug.pdfIn PDF document text
    • https://fapusogemewesil.weebly.com/uploads/1/3/2/3/132302858/fubamowozosika.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414159/normal_5fe52cd903c31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366020/normal_5feaed7d4987c.pdfIn PDF document text
    • https://kutakikojog.weebly.com/uploads/1/3/4/6/134688668/nevalusijan.pdfIn PDF document text
    • https://kepijiloxa.weebly.com/uploads/1/3/4/1/134108658/5910003.pdfIn PDF document text
    • http://xukiwowarenop.22web.org/java_j2ee_interview_questions_for_10_years_experience.pdfIn PDF document text
    • https://mubuxepuvu.weebly.com/uploads/1/3/1/3/131383429/9025602.pdfIn PDF document text
    • https://woxazalaxit.weebly.com/uploads/1/3/4/2/134235403/kosajanig-lobobati-relasapokunig-simotubawud.pdfIn PDF document text
    • https://xifexovajebim.weebly.com/uploads/1/3/0/7/130740184/5323685.pdfIn PDF document text
    • https://modefijibig.weebly.com/uploads/1/3/6/0/136011483/vevifuriwisaga.pdfIn PDF document text
    • http://repovor.22web.org/lezuvomavebitalageg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407081/normal_601ddea02c48c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479932/normal_5fc7c52733777.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nagudo/anthropometric_dimensions_of_the_human_body.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/deloxemutolivu.pdfIn PDF document text
    • http://bixodog.rf.gd/bozavotekarefuki.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/megulonemujevenojojaxejo.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/24813096222.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10343 5252 bytes
SHA-256: acc53c9b7dca0001eac7bdd8bfbd573948f70a8d8502f6c187f154ea82679af6
font_01_sfnt_off0001153b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153B 10780 bytes
SHA-256: 2ccb9572d532d41232825dcb2d7f4a6a1600879626cdd3c4b6430f43b3533536

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