Malicious PDF — malware analysis report

Static analysis result for SHA-256 baef1582e1f81f7c…

MALICIOUS

PDF

68.2 KB Created: 2021-02-25 18:26:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 391b84f7e27fd8ed4c9bfaecf87ed94f SHA-1: 39492f29381f44ca305d5022b5fc806c21e6bc72 SHA-256: baef1582e1f81f7cb472a86958380796178a3254ef54b965b80746727ab4838d
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirector infrastructure or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO spam. No scripts were extracted, but the link farm suggests an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=kitchenaid+model+ksm90+dough+hook In PDF document text
    • https://cdn.sqhk.co/tatiderubota/jcjaLUu/duck_donuts_hours_hauppauge.pdfIn PDF document text
    • https://midodelawipage.weebly.com/uploads/1/3/4/5/134585137/9268886.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419654/normal_5fced96109add.pdfIn PDF document text
    • https://komiwafaka.weebly.com/uploads/1/3/2/7/132712661/ridunodiratu.pdfIn PDF document text
    • https://cdn.sqhk.co/ninoporaleva/gjfgfWj/pdf_reader_viewer_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/ifVmYZY/6397905665.pdfIn PDF document text
    • http://zasasibibo.iblogger.org/25978408059.pdfIn PDF document text
    • http://vixerixobo.22web.org/baidu_browser_with_button_er_free.pdfIn PDF document text
    • https://tigakivukabor.weebly.com/uploads/1/3/1/1/131164093/343d5ae9a24.pdfIn PDF document text
    • https://cdn.sqhk.co/xanodujijefu/hhjaWLr/25382307509.pdfIn PDF document text
    • https://cdn.sqhk.co/jebavimot/hgg5Fjh/10233259296.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/jivamubug/bloons_tower_defence_6_ios.pdfIn PDF document text
    • http://rabopusafat.epizy.com/sagag.pdfIn PDF document text
    • http://tumofif.rf.gd/fezabobusuvo.pdfIn PDF document text
    • http://bavidoripo.epizy.com/epsxe_zlib1._dll.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_off0000cb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB28 5588 bytes
SHA-256: 91058f07618ca6e84fc52e85a76dfc69cf07b463017da8d6685136924edb8245
font_01_sfnt_off0000ddfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 11064 bytes
SHA-256: 0a73157df0a57bc610822e950e4aa100659a3df961e930dd9e11285fbdbda4e4

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