Malicious PDF — malware analysis report

Static analysis result for SHA-256 afdcd22490c1dfac…

MALICIOUS

PDF

80.2 KB Created: 2021-05-02 22:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bf01e366e44269bcc1896ba01bc517d0 SHA-1: be25ce5b279a295301c199614032ed1abe4bae9b SHA-256: afdcd22490c1dfacbc623ee116c86e675f889f609f045bdf09a6e4e0716c3a40
156 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 of which are hosted on dynamic DNS services or cloud storage, suggesting a link farm or redirection scheme. The heuristic PDF_SEO_LINK_FARM specifically indicates a mass of external PDF links, with one prominent example being https://s3.amazonaws.com/fulosobezur/bokupemiwupipejufubudik.pdf. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://xajibur.ru/strik?utm_term=nicholas+sparks+best+books+list PDF link annotation
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/soveruv_toworonomolet.pdfIn PDF document text
    • https://lefamadagizid.weebly.com/uploads/1/3/4/7/134704745/jumex.pdfIn PDF document text
    • https://vowexigap.weebly.com/uploads/1/3/1/6/131636774/josutibazugugedekato.pdfIn PDF document text
    • http://romomikas.22web.org/broomfield_college_uniform.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/fulosobezur/bokupemiwupipejufubudik.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/how_we_perceive_color.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c14f470d-f772-4575-9ba8-306242ef1a5c/56342581367.pdfIn PDF document text
    • http://kemiwadosu.rf.gd/28859552462.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/visusezuwiziramosoboro.pdfIn PDF document text
    • http://nisogifamesada.epizy.com/natewemetot.pdfIn PDF document text
    • http://tosuniwenalob.epizy.com/diccionario_caracteres_chinos.pdfIn PDF document text
    • http://jonufinufezo.epizy.com/adobe_fill_and_sign_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/suzuki_vitara_sidekick_manual.pdfIn PDF document text
    • http://kimitumepogamom.epizy.com/33341279616.pdfIn PDF document text
    • http://rorojuzuravix.epizy.com/how_do_you_write_a_summary_question.pdfIn PDF document text
    • http://vopawolug.epizy.com/phonetic_alphabet_police.pdfIn PDF document text
    • http://bikikifuxax.epizy.com/37217453470.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bab35e0-d0cc-4397-85e0-3033a4f45d57/the_golden_goblet_audiobook_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/52532341281.pdfIn PDF document text
    • http://gabifuzof.rf.gd/71535661317.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_off0000faed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAED 5192 bytes
SHA-256: 88ed01594fa15c5ea57411cebaa76821c8f0e2c30c0b577f72408f8332e61d20
font_01_sfnt_off00010c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8D 11460 bytes
SHA-256: fe6471cd5cf0e293ae691ca138e60b7b09c5045e0b84b057ce711cddc873fc9e

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