Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13181c9d466f2e2…

MALICIOUS

PDF

79.2 KB Created: 2021-04-14 00:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fcdf1998ece1ffc445def812dbc76b3e SHA-1: 8242858c079c36b472bde718599266eb2f687a40 SHA-256: f13181c9d466f2e2c9741b5bbe3c940fb676828cf073322a867b756caf8b4d6c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/strik?utm_term=troy+bilt+riding+mower+belt+replacement PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382208/normal_5fed655b2e469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403683/normal_5fe6620f4d509.pdfIn PDF document text
    • https://cdn.sqhk.co/rogudokives/pejcgrH/557879251.pdfIn PDF document text
    • http://milesatel.mygamesonline.org/handwriting_analysis_online_activity.pdfIn PDF document text
    • https://cdn.sqhk.co/xefanujere/hijgGjf/fitbit_inspire_2_band_size.pdfIn PDF document text
    • https://cdn.sqhk.co/safubuguva/khhicHd/descargar_pokemon_omega_ruby_para_citra_android.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_6028e8275b7bd.pdfIn PDF document text
    • http://gosunenibunale.getenjoyment.net/taxujawux.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/kojidolakojava.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/iajg6jc/how_to_charge_irancell_sim_card.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487903/normal_5fff6aca6716f.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/rebomedug/section_6.4_traits_genes_and_alleles_section_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/angielski_w_tumaczeniach_4.pdfIn PDF document text
    • http://jototaniruf.rf.gd/how_to_remove_kidde_alarm.pdfIn PDF document text
    • https://e1c07d4e-6587-4767-b76f-5dea9cf3e327.filesusr.com/ugd/51a829_b4ba9f9bb7f441dda1d2bd805c15e529.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/fotijesiwumakuviwuxatevef.pdfIn PDF document text
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_f094f7d5c83a4b99b9dcaca8b543d10b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/7958961288.pdfIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_8687f37d8de1497eab5c95e871525ffb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/zujuvujer.pdfIn PDF document text
    • http://dekifovep.epizy.com/gijawove.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_off0000f7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FD 5496 bytes
SHA-256: 1d3b198a1ddf9ee6437de10d28866585b0321929d3ba28c0575125f2e42394a1
font_01_sfnt_off00010aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAA 10776 bytes
SHA-256: 12a338db31e9cf22571dc77bc3834dc88cc49045dd02e7821b20354ba3891149

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