Malicious PDF — malware analysis report

Static analysis result for SHA-256 9902423c005363d8…

MALICIOUS

PDF

78.1 KB Created: 2021-06-12 15:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d6db472f4c3a9880a440bfef4c6b4e70 SHA-1: 49922ec499b4a1af723013fca77be0372f0b176f SHA-256: 9902423c005363d8101d38fe5ad132af4829e8a15a347c112836ce028dcda5bf
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, impersonating a cloud document service to entice users to click on embedded links. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a potential link farm designed to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://archism.ru/pbw?utm_term=android+tv+allow+unknown+sources PDF link annotation
    • https://bigabupagekul.weebly.com/uploads/1/3/4/6/134667232/7395211.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474759/normal_605d8ca969671.pdfIn PDF document text
    • https://dubilovatigalis.weebly.com/uploads/1/3/4/7/134701517/rurijuxeneb-zisunobaju-wofilaso-digoduluvop.pdfIn PDF document text
    • https://mefomenixa.weebly.com/uploads/1/3/4/2/134235772/5613854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_6035d7cb7cc2a.pdfIn PDF document text
    • https://pogedefulelot.weebly.com/uploads/1/3/4/6/134628496/5168793.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419654/normal_603478e6e8e16.pdfIn PDF document text
    • https://koxewujinam.weebly.com/uploads/1/3/3/9/133986689/zanugimo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489240/normal_5fea34b9dc0f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489848/normal_605ff7c71aa17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381108/normal_60b9edff6ee06.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jixerumuji.pbworks.com/w/file/fetch/145159830/esp8266wifi_h_library_download_github.pdfIn PDF document text
    • http://zilebunod.pbworks.com/f/how_to_attach_swiffer_wet_jet_pads.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18793a02-a3f9-4098-8fb3-6a44c5df90f9/how_to_write_a_great_research_paper_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee9ae116-2c35-4bbe-88bf-f575fa8843c7/telecharger_delphi_ds150e_2016_crack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5788570f-f8e5-46fa-ad7f-a79c74221467/epson_xp-424_black_ink_not_printing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6349adab-86c8-4c70-a937-53e61a778487/how_do_i_become_a_child_spy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c6e0669-6cf5-4515-8d71-ea5f5651e978/jalopibusinodazebevibower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/524ef485-3490-481c-82c0-84868d49f024/what_does_apley_scratch_test_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e845c608-0433-40e6-a677-e399fa5d0a2b/inglorious_empire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8037f3e1-7498-4f22-af6a-d3cc07f7f6a1/jodabavi.pdfIn PDF document text
    • http://nutafojijoki.pbworks.com/f/21192492279.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BC 5020 bytes
SHA-256: bbf3ce5badd30d1d0f6b6fbb5672f0098003b3c49a6efa84038d475f8f80c12c
font_01_sfnt_off0000f6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EB 11000 bytes
SHA-256: 99fd82fc5b8eb5851383945e9fc2492be459e7f2770e0fa33323b4e1647ef3b5
font_02_sfnt_off00011cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAB 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e