Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8a9fad666c5cdd…

MALICIOUS

PDF

95.3 KB Created: 2021-03-20 10:39:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 67ec8dc7e5028b9cbdbc8c2dec6a34a6 SHA-1: 0676d93ecce3a57631b5b81dccb0a9fbf8498cb0 SHA-256: 6c8a9fad666c5cdd44030124b41b6782de603e138d760e22f0e5ba2ed768a4cb
186 Risk Score

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 0.9993

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://botokaw.ru/123?utm_term=carl+jung+aion+pdf PDF link annotation
    • https://xavabijikuz.weebly.com/uploads/1/3/1/6/131636819/2844388.pdfIn PDF document text
    • https://bupafenanibud.weebly.com/uploads/1/3/4/0/134042845/vezabusamo.pdfIn PDF document text
    • http://dejepuzalew.mygamesonline.org/data_structures_and_algorithms_tutorial_free_download.pdfIn PDF document text
    • http://pebifakonek.sportsontheweb.net/writing_internships_summer_2021.pdfIn PDF document text
    • http://bella24.xyz/19266185887i17f.pdfIn PDF document text
    • http://tanemazijafawin.medianewsonline.com/birifotowa.pdfIn PDF document text
    • https://bevabuje.weebly.com/uploads/1/3/4/8/134897483/564018d598ff.pdfIn PDF document text
    • http://zigapajuxijado.mywebcommunity.org/gobodegitus.pdfIn PDF document text
    • http://vegifeda.mypressonline.com/xerodubigiwazavem.pdfIn PDF document text
    • http://bimonetejatoleb.mygamesonline.org/zugijok.pdfIn PDF document text
    • http://xodaxedepapopox.mygamesonline.org/the_devops_handbook_by_gene_kim.pdfIn PDF document text
    • https://tokemata.weebly.com/uploads/1/3/6/0/136081978/8e2a1285dc8.pdfIn PDF document text
    • http://madoxorijegobe.sportsontheweb.net/maus_implement_co.pdfIn PDF document text
    • http://sefegusekepuxa.mypressonline.com/dixijumizuwalabofuriwexij.pdfIn PDF document text
    • http://maewallace.com/how_to_thread_singer_promise3ti62.pdfIn PDF document text
    • http://merovew.xyz/47548203094cz7oe.pdfIn PDF document text
    • http://nosatines.mypressonline.com/femaniluj.pdfIn PDF document text
    • https://nepejudakolop.weebly.com/uploads/1/3/4/8/134876169/xezetonolivud_xovav_xadivigojugakev_tozetonifar.pdfIn PDF document text
    • http://profmaster74.ru/62571078264a77hn.pdfIn PDF document text
    • http://xodaxedepapopox.mygamesonline.org/74078655102.pdfIn PDF document text
    • http://am-sound.ru/tower_defense_games_pcuhsri.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://70745723-7f4a-4dc7-98be-95bdce43cd82.filesusr.com/ugd/67bae7_78c854935da64bd09d85041f8ca59165.pdf?index=trueIn PDF document text
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_7f0bab8bc10749b69b830da8bd3f623b.pdf?index=trueIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_431442bcb99147beab189a8dbf1590b3.pdf?index=trueIn PDF document text
    • http://kofepiropi.onlinewebshop.net/audi_s4_b5_avant_rear_bumper.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_off000138e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E8 5012 bytes
SHA-256: 5c3717de64e7d6298aec777e12d32b57404c508b8a5a18718a8eca2a7cfe1f9a
font_01_sfnt_off00014a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0B 11236 bytes
SHA-256: c1bf116cf511c50c126010da0805b64bfd697c9a67d969598d41578512ca15b8