Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8791e34d64ce916…

MALICIOUS

PDF

81.1 KB Created: 2021-04-15 05:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 50340c362fd2542219c55a2295bd7cfc SHA-1: 2b4b7511fb04a4df8ed93a7d18f3e8944d6418b0 SHA-256: b8791e34d64ce916e2382a58c9ad4a4cbe8a3a0d374229cd88b97127dd37c877
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 0.9998

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
  • 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://vilenefex.ru/strik?utm_term=the+most+popular+music+in+nigeria PDF link annotation
    • http://lnstagram-blue-ticks.com/how_do_i_start_my_bosch_800_series_dishwasher9kr7i.pdfIn PDF document text
    • http://wuvilorilete.22web.org/zokeguxijelo.pdfIn PDF document text
    • http://vepivatalaj.iblogger.org/kefikofaweforiwabukepi.pdfIn PDF document text
    • http://blekrossi.ru/danube_cruise_guide_budapestbzw2u.pdfIn PDF document text
    • http://begetus11ppz.xyz/97020543864d78mh.pdfIn PDF document text
    • http://rewita.fun/52438662198175lw.pdfIn PDF document text
    • https://zetosodorab.weebly.com/uploads/1/3/2/7/132712291/porububit.pdfIn PDF document text
    • http://mrshadow.net/what_to_do_with_flamethrower_in_little_alchemygglfm.pdfIn PDF document text
    • https://bejobajota.weebly.com/uploads/1/3/4/7/134727936/7e0beb0fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/db42217c-5f26-45e4-9174-c14e5693fc46/33664212430.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/36843858569.pdfIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/toner_para_impresora_brother_mfc-8480dn.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/63059095003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a43b3851-6bb4-48fe-80f4-69143d52f366/58316299266.pdfIn PDF document text
    • http://genavologu.rf.gd/ashton_drake_monkeys_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/green_top_guidelines_for_induction_of_labour.pdfIn PDF document text
    • http://tixinova.rf.gd/acids_bases_and_salts_worksheet_answers_crossword.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/22915781291.pdfIn PDF document text
    • http://bubewap.rf.gd/senodelanutegakegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f8e82e2-c4ea-4e95-a4d2-8abb92579e38/zabefofabefenobovojil.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_off0000fc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC48 5296 bytes
SHA-256: b7f143e01e28832963ed4d3040667c4aa2c6360ae9d35f2db6874dfd8169bfc4
font_01_sfnt_off00010e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1D 11440 bytes
SHA-256: b87f577b5baa8c0032f675c3a308a202ef3e2caf368c1b28c14ae2732c8a0b45

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