Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a375a63ed13f61a…

MALICIOUS

PDF

73.0 KB Created: 2021-02-19 03:56:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 084023f37a34e22ab2a8ee0b04276986 SHA-1: 73d3aedda3b3223e040af18d4a5c529ba3466965 SHA-256: 3a375a63ed13f61afcbf9f0e5a7c8ec9f88fd2af2a850533a30be01ee5b48b56
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=magic+chef+mcwc28b+28-bottle+wine+cooler+review PDF link annotation
    • https://jorosovepi.weebly.com/uploads/1/3/4/7/134706332/5e1229c96a5169d.pdfIn PDF document text
    • https://dexovepiniputo.weebly.com/uploads/1/3/4/4/134400909/pugezekawoti.pdfIn PDF document text
    • https://mojogobiwed.weebly.com/uploads/1/3/4/7/134747953/102b9.pdfIn PDF document text
    • https://wesuzijuto.weebly.com/uploads/1/3/0/7/130740493/8d5fbb6e9cdc6a.pdfIn PDF document text
    • http://trellos.fun/barbarian_queen_1985_movie9p19o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421217/normal_5ff994669ece3.pdfIn PDF document text
    • https://sizomejuxitiz.weebly.com/uploads/1/3/4/7/134748976/69183d9.pdfIn PDF document text
    • https://zokukomusisitu.weebly.com/uploads/1/3/5/3/135323242/7863405.pdfIn PDF document text
    • http://axecheat5.xyz/american_english_file_1_descargar_gratisjalel.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/lurutopobi/kozarenonolebepelapigenez.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/oh_baby_tamil_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/lumezekuwifilefaxakod.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_off0000de77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE77 5772 bytes
SHA-256: 6c1618c9b0760e2849d8988959399bea37b435d9944fc16e59db649c5c1ec767
font_01_sfnt_off0000f229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 10848 bytes
SHA-256: 29079fc47cd4d02546f5d5688d25fd5be3613f7f024b2810c5fa584f926e49c9

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