Malicious PDF — malware analysis report

Static analysis result for SHA-256 f06625fa0ff4338b…

MALICIOUS

PDF

84.6 KB Created: 2021-06-05 15:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 75ffd72ecc25b80e14f61eca2b161b14 SHA-1: e4e5bea261e8159c3754863912af320122583a66 SHA-256: f06625fa0ff4338bf7ee5cb331dd204e943a03bac5ccc660a2d6f3750536e815
194 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to disposable hosting services and are likely part of a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to lure users to malicious sites, potentially for phishing or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/pbw?utm_term=estrategia+de+ense%25C3%25B1anza+y+aprendizaje+a+distancia+parte+i PDF link annotation
    • https://midunaso.weebly.com/uploads/1/3/4/6/134680252/f12ccfff13a0b2.pdfIn PDF document text
    • https://xafosaxit.weebly.com/uploads/1/3/1/8/131859261/mavudoravejumul.pdfIn PDF document text
    • https://mapimodedafibo.weebly.com/uploads/1/3/4/7/134708703/rosisimise.pdfIn PDF document text
    • https://ridakikasidom.weebly.com/uploads/1/3/0/7/130739592/nimunizu-bipewedebuxi.pdfIn PDF document text
    • https://danifiwap.weebly.com/uploads/1/3/4/5/134585556/dafevujodetorito.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ridelox.pbworks.com/w/file/fetch/144471087/what_does_the_purple_hibiscus_symbolize.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/w/file/fetch/144425955/alif_laila_sindbad_episode_19.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a244a9-a9d9-4358-a871-86204a5c6c2f/99544858622.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144557055/barefoot_in_the_park_full.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a0f1a59-d158-4713-a5c0-f111b99ea817/selip.pdfIn PDF document text
    • http://kuzimotum.pbworks.com/f/gta_vice_city_cheat_codes_free_download_now_android.pdfIn PDF document text
    • http://tagexoba.pbworks.com/f/what_is_the_answer_to_the_riddle_of_the_two_doors.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/how_many_types_of_x_ray_machines_are_there.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/how_to_get_my_w2_from_my_last_job.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d32e5af-1651-44cf-b4d7-2e201c2157a3/53448896676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9004ca77-ac38-4844-baf4-d61102c50f30/zinariwudepegudeb.pdfIn PDF document text
    • http://lorugaz.pbworks.com/f/72651495555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9490e695-fae4-4015-9801-e50bfde930c6/96989282103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9d5a408-2207-4f97-b584-a2572e5e9535/18460523608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a347ea0-e752-4fd3-a0f4-db3ca11a0ea7/17406084198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97cdc098-28c0-42b2-a595-1148ac65bf16/jibetoferama.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/f/how_to_unblock_caller_on_panasonic_home_phone.pdfIn PDF document text
    • http://gosirata.pbworks.com/f/puzotefipejexifumerek.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/w/file/fetch/144653157/63523209597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b1d2892-2386-4125-a315-ccfe08b34da2/que_es_talleres_de_aprendizaje.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_off00010863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10863 5604 bytes
SHA-256: 2e6be9a4e7ba2dea7b22e9e1561912c8e9d91958d08cb60f8ca06498443f2e6e
font_01_sfnt_off00011b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5C 11720 bytes
SHA-256: c8b61634a4e6c46dc185cc05a1411c961e2c9962aded16af54fe31ba72fbbd9a

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