Malicious PDF — malware analysis report

Static analysis result for SHA-256 15045c1c99977e7d…

MALICIOUS

PDF

79.4 KB Created: 2021-03-25 04:45:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe9f48c6d061b39a38ab69bcf303fb07 SHA-1: 9ef5aedacabb99c15cff7c0bb3f29aa78c9de321 SHA-256: 15045c1c99977e7d13d0cd628761f8095bbae804dc16ae9bb34382348403894d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a PDF link farm, suggesting an attempt at SEO manipulation or distribution of further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/award?keyword=book+review+of+wings+of+fire+pdf
    • https://cdn.sqhk.co/wogokodu/h0jahgi/15255706427.pdf
    • https://cdn.sqhk.co/xurazegoba/hj59jaa/server_stats_discord_bot.pdf
    • https://cdn-cms.f-static.net/uploads/4408323/normal_6057b44fc8f87.pdf
    • https://cdn.sqhk.co/kojupiloxifi/1r6jgtx/50790877481.pdf
    • http://wegolurubakisud.22web.org/aaja_mahi_song_mr_jatt.pdf
    • https://cdn.sqhk.co/nolagutotato/hhfEZii/selibibudas.pdf
    • https://cdn.sqhk.co/xijogedobu/7wjiHiU/fiwifogefupefoxijikilo.pdf
    • https://cdn-cms.f-static.net/uploads/4479932/normal_60219456ee6cb.pdf
    • https://static.s123-cdn-static.com/uploads/4465387/normal_5fcfb0a3c6322.pdf
    • https://cdn.sqhk.co/bogulevim/ihheigd/lebirudon.pdf
    • https://cdn.sqhk.co/sepufaziru/gihaKic/51463883934.pdf
    • https://cdn-cms.f-static.net/uploads/4496816/normal_60108434ec55c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_cc3f513d20294cdc80435008cf546ba7.pdf?index=true
    • https://s3.amazonaws.com/lixuduwonifa/how_to_charge_petsafe_dog_collar.pdf
    • http://vamejojupilo.rf.gd/15110349921.pdf
    • https://s3.amazonaws.com/metubevozisul/cisco_sg200-26p.pdf
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_d0a035a949a14d9f83a0c97217d755f3.pdf?index=true
    • http://nisanasedupava.epizy.com/as_10_icai.pdf
    • https://s3.amazonaws.com/banula/lumarolagarevuligitonov.pdf
    • http://jimanujomubil.epizy.com/36701805264.pdf
    • https://s3.amazonaws.com/geraromu/dojojuvulogusoxefu.pdf
    • https://s3.amazonaws.com/bulujono/49195349918.pdf
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_5b901170feb54a7b8d0b78fdaef52815.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea64.bin
d2681e1f0908945b2464faa0394614c680d4a24d85130324e6d5d92f4ae4f507		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 4940 bytes
font_01_sfnt_off0000fb54.bin
5c4e571287dd79a94d218834e60d9b06bc061aa111d32598e413e8652df532b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB54 10852 bytes
font_02_sfnt_off00012046.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12046 4324 bytes

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