Malicious PDF — malware analysis report

Static analysis result for SHA-256 427b56d13e760087…

MALICIOUS

PDF

74.5 KB Created: 2021-02-24 14:26:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c8d1d7a77c8c1e0d9aef8753bffa5a49 SHA-1: 2c4dc2a80257de6201e76f282c10ad56edc65bd7 SHA-256: 427b56d13e76008741fd2159b4f4cbbae6b7a8daf2daefa2b39023006e2ab6ec
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=ejemplos+de+pronombres+relativos+en+ingl%25C3%25A9s PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383586/normal_5ff8c442d68bd.pdfIn PDF document text
    • https://kuxijixa.weebly.com/uploads/1/3/4/8/134856984/627113.pdfIn PDF document text
    • https://miwevedadig.weebly.com/uploads/1/3/1/4/131437981/xixitezipig.pdfIn PDF document text
    • https://tubidurifubadas.weebly.com/uploads/1/3/4/8/134885002/ec5909.pdfIn PDF document text
    • https://kibodoru.weebly.com/uploads/1/3/2/6/132695707/jifaraj.pdfIn PDF document text
    • https://sitakubijilu.weebly.com/uploads/1/3/0/7/130776110/zaxasigudi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370264/normal_5fce82988c7d0.pdfIn PDF document text
    • https://puxizabub.weebly.com/uploads/1/3/1/4/131406372/3594985.pdfIn PDF document text
    • https://zuzesewijolane.weebly.com/uploads/1/3/1/4/131406438/5650286.pdfIn PDF document text
    • https://femukigiterabe.weebly.com/uploads/1/3/2/7/132740239/9287410.pdfIn PDF document text
    • https://xumebarukez.weebly.com/uploads/1/3/4/6/134687090/fazupedagojof_kagorido.pdfIn PDF document text
    • https://renepavavoz.weebly.com/uploads/1/3/4/0/134012855/a1c88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://favuzokusom.rf.gd/chandrakanta_novel_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/77586780700.pdfIn PDF document text
    • http://bowudizukeb.epizy.com/chilling_crossword_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/xemuxexijelekagamagolomox.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/hotel_invoice_template_india.pdfIn PDF document text
    • http://zimemotom.rf.gd/how_to_become_an_aa_approved_garage.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_off0000e06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06B 5656 bytes
SHA-256: 87c51c234146d64d852e2fb75701c46300c98037d7c832eb4e5009dd6d6283a8
font_01_sfnt_off0000f34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34E 11932 bytes
SHA-256: ae46c1a548bb8e554b242aa2a5d7b44ecf847c11ddf9c869b900a900e04cf576

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