Malicious PDF — malware analysis report

Static analysis result for SHA-256 508fa5d7e34d0538…

MALICIOUS

PDF

70.2 KB Created: 2021-02-25 23:58:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: caa6008ae5687ce334f1d373b6bd20a8 SHA-1: b6e82a7a59b48840001fd2660f10c6fe9b98c0b4 SHA-256: 508fa5d7e34d053876ae12c9768d32f779d0ceb70c6017205ba97e13f77bd5b0
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document contains a large number of external links, many of which are SEO-optimized, suggesting an attempt to drive traffic to malicious sites. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious intent to redirect users to potentially harmful content.

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://seumenha.ru/123?utm_term=comptia+network%252B+n10-007+mike+meyers+pdf PDF link annotation
    • https://cdn.sqhk.co/wazikunal/8ihHiiC/dosikabedinep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392868/normal_5fff6e7553fdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405687/normal_600b2e97a0ee9.pdfIn PDF document text
    • https://cdn.sqhk.co/gixezovof/gdhbvjb/88798083778.pdfIn PDF document text
    • https://cdn.sqhk.co/zidenesek/hPkPN5N/movie_matinee_definition.pdfIn PDF document text
    • https://velineninebag.weebly.com/uploads/1/3/4/6/134608195/33a2f43294c.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/aHRidgc/top_ringtones_from_tik_music_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494866/normal_603062e680e35.pdfIn PDF document text
    • https://cdn.sqhk.co/runenuti/Lhbrnjh/xesite.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/wozoxub/forms_of_energy_ppt_9th_grade.pdfIn PDF document text
    • http://magegefopo.atwebpages.com/pusekebu.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_off0000d4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A2 5624 bytes
SHA-256: 8bba814bc90b6dc2da844d96fd1c42b050fb3d32c630f22f30b41ff53a36360a
font_01_sfnt_off0000e7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E2 10472 bytes
SHA-256: 3ab60976f02cf5a63c40904b4940c26758c6863d76cfcdf535123cd90e418fae