Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a217f09ceadabd…

MALICIOUS

PDF

76.2 KB Created: 2021-03-12 11:22:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 861330dc20aa12dac7b400f9386a9908 SHA-1: 99b2a40b1b8f036f1d5afd70c06aa06636f1c085 SHA-256: f5a217f09ceadabd18e47298583530b504d8d31af664c36c0f05cd342862fa7d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by both ML classification and ClamAV, with a specific detection of 'Pdf.Phishing.Trojan'. The heuristics indicate it functions as a link farm, embedding numerous external URIs, many of which point to disposable hosting. The primary purpose appears to be directing users to potentially malicious or SEO-manipulated content, rather than delivering a direct payload within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/award?keyword=abstract+noun+list+a+z+pdf PDF link annotation
    • https://wugowimuvup.weebly.com/uploads/1/3/4/7/134762233/lunugokenu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455884/normal_603b9f51afdfd.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/xixakapajenatiri.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/fhfXyjc/dinuruwonuzel.pdfIn PDF document text
    • https://fagutefoxod.weebly.com/uploads/1/3/4/2/134235025/8704589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445750/normal_6021d30588454.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500440/normal_604a23e33ee3e.pdfIn PDF document text
    • http://jasazotinalol.mygamesonline.org/mopux.pdfIn PDF document text
    • http://wowogobofomufu.mygamesonline.org/sbg6782-ac_forgot_password.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/ghJEbpI/ice_cream_maker-_sundae_frozen_foods.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/3438368554.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/Cgc7hdv/country_music_singers_2019_male.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc0d14f9-cb47-4455-b3a2-be0077eb254a/ozone_500_bike_29_inch.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/korean_action_movies_with_english_subtitles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a3480e0-4f13-4760-a18d-67a8781896c3/58296756075.pdfIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/61807094263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49309f35-6b81-4091-9742-5d2d3f2e61d8/liane_moriarty_the_husbands_secret_spoiler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e3cffc-7328-43da-870e-eedf9ab816d6/ligisataragodu.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/21132426738.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/jejedelekinikoso.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/how_cold_is_too_cold_for_pouring_concrete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f14fa7d3-9fd9-453f-bf33-1774d8b7d2d7/7_elements_of_music_dynamics.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_off0000ef03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF03 5328 bytes
SHA-256: 9fc992f00ae1850910137640010622485870200252505c4658641a35f61a5a31
font_01_sfnt_off00010132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10132 9956 bytes
SHA-256: 48579bdd380ced50a42774142ca8fb45a8d0c7bef34adf299851373e1108c770