Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e61faa235a9a125…

MALICIOUS

PDF

78.2 KB Created: 2021-03-31 03:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5e3feaa48cae05d69d1aee1f57fd9eb5 SHA-1: d4cd93e85da58a502d49bc701c3dec9d0240641d SHA-256: 7e61faa235a9a125cefaaff1f70d02d84ec3530589627a7a73fce145f4ff8656
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/wix?keyword=chemical+formula+worksheet+with+answers+pdf
    • https://kukanoli.weebly.com/uploads/1/3/4/6/134641169/fasopajazebetatu.pdf
    • http://pazifelurup.medianewsonline.com/do_hansel_and_gretel_die_in_the_original_story.pdf
    • http://dedigevobunobe.medianewsonline.com/kipafaxupokiro.pdf
    • http://dokarukaxita.22web.org/suddenly_seventeen_chinese_movie.pdf
    • https://xibowawagapuj.weebly.com/uploads/1/3/1/3/131383975/6196310.pdf
    • http://tadosuzewamu.medianewsonline.com/76381093594.pdf
    • http://sepoxudozixo.sportsontheweb.net/phenolic_compounds_book.pdf
    • http://moxolesapudeli.22web.org/all_in_one_old_games_apk.pdf
    • http://vitofemegawe.getenjoyment.net/gersan_cable_tray_catalogue.pdf
    • http://duzixofiwisegi.mygamesonline.org/fuwetupofexumoloro.pdf
    • https://lekibuwowobaveg.weebly.com/uploads/1/3/5/2/135295955/848792.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://binuwuzipu.myartsonline.com/bsc_1_year_chemistry_notes_download.pdf
    • https://s3.amazonaws.com/nodetuxapabara/78653687433.pdf
    • https://s3.amazonaws.com/lebaxa/experimental_ablations_were_first_performed_by.pdf
    • http://kutoxinupuroxo.onlinewebshop.net/arithmetico_geometric_progression.pdf
    • http://sutijipekopavob.rf.gd/bosch_axxis_washer_laundry_detergent.pdf
    • https://s3.amazonaws.com/lodazojamuva/19899950882.pdf
    • https://s3.amazonaws.com/tigovatolis/city_of_omaha_human_resources_phone_number.pdf
    • https://s3.amazonaws.com/futamo/23306329539.pdf
    • https://s3.amazonaws.com/fejenijovekozu/26756842391.pdf
    • http://teluroluxeterez.myartsonline.com/840997641.pdf
    • https://s3.amazonaws.com/zikeko/75713433667.pdf
    • https://s3.amazonaws.com/fizaxo/where_can_you_buy_champion_generators.pdf
    • https://s3.amazonaws.com/lixasifasi/emulator_androgens_apk.pdf
    • https://s3.amazonaws.com/juzowilipi/canon_inkjet_ip4500_series_manual.pdf
    • http://pevogikuxupeja.onlinewebshop.net/39079499409.pdf
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f21b.bin
65a55413ba249f962de692d54b024aead0234bb83dbd7cf70caa44abb9cc405c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 5456 bytes
font_01_sfnt_off0001048c.bin
c4f4d7013a8b7e6f411bc4fcd334584f1f487de72216c3c0b17dfa736d7283d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1048C 10804 bytes

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