Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c309167cdfb56d…

MALICIOUS

PDF

89.4 KB Created: 2021-03-28 00:23:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72b7b58a63d240a155e93a7379722236 SHA-1: 2776009f5527adbf4abb517c7c1040eff123428f SHA-256: b4c309167cdfb56d74f84f324b797fb3713149a8776d60a33a8294e09e1cda77
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to seemingly unrelated PDF documents, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://zajinet.ru/wix?keyword=words+that+begins+with+g
    • https://sugelama.weebly.com/uploads/1/3/4/8/134898925/381340.pdf
    • http://retoxen.mypressonline.com/procreate_line_art_tutorial.pdf
    • https://gidepojijozi.weebly.com/uploads/1/3/4/2/134235950/34424c8fc74.pdf
    • http://lumufurisazela.mywebcommunity.org/ashrae_standard_62._2.pdf
    • https://cdn.sqhk.co/murafabu/bvgcHaG/fitojazamurosevuxoforodis.pdf
    • https://foraketarikovef.weebly.com/uploads/1/3/4/6/134608655/wixifuxo.pdf
    • https://nobopejulalajib.weebly.com/uploads/1/3/4/6/134621416/xokojuwijivo.pdf
    • https://mikatafa.weebly.com/uploads/1/3/1/3/131398449/xarobuzodimidox_gibilukomule_kaleronesuda.pdf
    • https://befewegumezozem.weebly.com/uploads/1/3/1/4/131453636/gopowabadaratus.pdf
    • https://gapojusegora.weebly.com/uploads/1/3/1/4/131408170/2539610.pdf
    • https://nodokesomizi.weebly.com/uploads/1/3/4/6/134656280/tawagulibuwug.pdf
    • http://sovumeriwox.mygamesonline.org/36638001659.pdf
    • https://dipabuxirakilat.weebly.com/uploads/1/3/1/0/131071076/dawilupuniwunas.pdf
    • http://waragofekoxexaz.sportsontheweb.net/understanding_dog_body_language.pdf
    • https://cdn.sqhk.co/gijimexuv/dp7NOdc/raft_survival_forest_2_mod_apk.pdf
    • https://xasavogo.weebly.com/uploads/1/3/1/8/131856096/44efbe1b06afa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kiguteperilodu/fijajosamadusozoruma.pdf
    • https://s3.amazonaws.com/xeroguru/81123696174.pdf
    • https://c7e723d0-7712-45a3-a8dd-8d8935e7c5e2.filesusr.com/ugd/c4f451_0c26f7b5b2f94fd58b546342a7c6acb1.pdf?index=true
    • https://7c50ec62-1ece-451b-b03c-4788199016cf.filesusr.com/ugd/635f3c_107125a06fb14c9e93e77f740fcc3c92.pdf?index=true
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_d364510efd114298a69a02ec3440cf13.pdf?index=true
    • https://s3.amazonaws.com/pujirageg/break_up_with_your_girlfriend_karaoke.pdf
    • https://s3.amazonaws.com/sedowedi/rajasthani_bhajan_audio_songs.pdf
    • https://s3.amazonaws.com/faluzotixupi/daily_expense_sheet_format.pdf
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_b9ecf1cb8592483a9d750f5e2c8e00f0.pdf?index=true
    • http://wejajesenopezoj.onlinewebshop.net/geez_amharic_bible.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_off00011f60.bin
5dc817c5174eb60558758b43a8098899dd297c4d186f8fa0ba0313d3b7e0e7ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F60 5300 bytes
font_01_sfnt_off00013175.bin
6d8a8743b3560615c88da8a641366c4636af84c759b44f88a8955a935e583cf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13175 11404 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.