Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9a3092ffcb2122…

MALICIOUS

PDF

77.8 KB Created: 2021-02-19 16:30:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: da9ead1cab94c32622272d80cc883355 SHA-1: deaf6310bb8070a13dc87e5e1d1843eb4aea54fa SHA-256: da9a3092ffcb212297ece864d3615b5cf5ab99b9715268a7e312b3e8dfc4ae3f
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a known malicious redirector at 'https://yafferge.ru/strik?utm_term=pl+sql+developer+resume+4+years+experience'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting a tactic to distribute malicious content or engage in SEO manipulation for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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=pl+sql+developer+resume+4+years+experience In PDF document text
    • https://gaduforijap.weebly.com/uploads/1/3/1/3/131381464/lusokugawawus_bobonidovavag.pdfIn PDF document text
    • http://balifruit.com/tutorial_autodock_vinaim4qq.pdfIn PDF document text
    • https://kuwugexikoxol.weebly.com/uploads/1/3/4/7/134718068/ritori-xukedoter-buwiwobikir-piridoduxitemi.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/tosede.pdfIn PDF document text
    • http://submonster.xyz/glencoe_algebra_1_6-_4_practice_answersc6rf8.pdfIn PDF document text
    • http://goproits.com/bsc_part_3_chemistry_practical_booko32k0.pdfIn PDF document text
    • http://mipuruf.22web.org/famonol.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/metubevozisul/podivifuwijidewanima.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/75347181289.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/90490347775.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/sargodha_university_admission_form.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/91258278879.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/bollywood_music_video_hd.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_off0000f462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 5664 bytes
SHA-256: e6968252dd1952d97086b65c50655f48414b12d33be8aec0573ca83144bbdd3c
font_01_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 10136 bytes
SHA-256: a8c36be9b30e6e74aeadd558a33012f21b959f8f5b26e0bdc3c053f6ed7bf8e6

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