Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8ff0e1237c5795…

MALICIOUS

PDF

78.4 KB Created: 2021-03-24 16:30:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8944a598bf3f8279c6db2a79af42b43 SHA-1: 10c4cf8b5cf91ff0b4f32677783d1e1dd27a4447 SHA-256: 8b8ff0e1237c579596e8a62f9fa184decbe245f2ccdd4090d559c6576adbe29d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a suspicious domain associated with malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download further payloads. The document body, though heavily obfuscated, suggests a lure related to a presentation summary.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=4+disciplines+of+execution+summary+ppt
    • http://finomimetafix.sportsontheweb.net/love_story_movie_2019_new_release.pdf
    • http://tunewejewuz.mypressonline.com/audacity_2._2._2_manual_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_6b095ce709ff4e1fa0e12de1bc843c8c.pdf?index=true
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_b568ba96ca664551b2709560812d5135.pdf?index=true
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_cafbc5e99b394f06af945b7065d8a263.pdf?index=true
    • https://uploads.strikinglycdn.com/files/95186882-9c2f-4405-8a00-df2454f8ab44/puwoguzudobonosinimapuv.pdf
    • https://uploads.strikinglycdn.com/files/e1f7ecc4-dbf3-4fe5-b38c-6fcd760d439d/neil_degrasse_tyson_twitter_new_years.pdf
    • https://s3.amazonaws.com/jeduzizonox/kulogomo.pdf
    • https://uploads.strikinglycdn.com/files/bbb211ad-b3de-4f97-969a-436ba53462bd/pizirexusuridepetaliv.pdf
    • https://s3.amazonaws.com/waxegatulo/clasificacion_de_las_cuentas_contabilidad.pdf
    • https://uploads.strikinglycdn.com/files/8c2e319d-42c3-43d6-837a-4c01701a0895/togofakewatixe.pdf
    • https://s3.amazonaws.com/zozuxukoxo/strangers_in_their_own_land_goodreads.pdf
    • https://s3.amazonaws.com/fujadabez/happy_birthday_piano_music.pdf
    • https://s3.amazonaws.com/midaguvimabof/vubegajoruwunudutirutek.pdf
    • https://uploads.strikinglycdn.com/files/26505278-6668-483b-9175-d49b1ea80172/dir-615_firmware_20.07_download.pdf
    • http://kulebosux.myartsonline.com/normandin_menu.pdf
    • https://uploads.strikinglycdn.com/files/206d6ae2-0335-4f2c-8231-ff6a68567637/56986370699.pdf
    • https://uploads.strikinglycdn.com/files/52611941-7fc5-44d0-8beb-7c3a0762bcdd/jagulumijuvokejo.pdf
    • https://s3.amazonaws.com/xasovewipeje/hills_j_d_canine_feeding_guide.pdf
    • https://s3.amazonaws.com/wusigipufuvowix/femiwuxurexu.pdf
    • https://s3.amazonaws.com/tumasun/palo_alto_panorama_force_template_values.pdf
    • https://s3.amazonaws.com/juzewojavomofew/teramakizijize.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_off0000f2bb.bin
ae73c11b54c4e50d795b50d0d31d127c1749cdc46cea34f757c79082114681a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 5464 bytes
font_01_sfnt_off0001054f.bin
73f8a63b30f2594d0c49a8bc2b7c9a61db77d223656914b69e65b7fb0f15bec9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1054F 11476 bytes

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