Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfb1f5977d7bc41…

MALICIOUS

PDF

94.4 KB Created: 2021-04-03 00:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: aeb1a178371a2d40f0d975616b1e7888 SHA-1: f54be3e417beaa742667999b7a6ea6354f8375c5 SHA-256: ecfb1f5977d7bc4161e2a0fbd4b4bd7e46c61e995a4e742e44142683bf00886e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit users by directing them to potentially harmful content.

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://baarspo.ru/123?utm_term=ielts+academic+writing+task+1+template+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478123/normal_6044251fa611b.pdfIn PDF document text
    • http://natosabi.mygamesonline.org/cellular_humoral_immunity.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485568/normal_5fcda64e9564f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386618/normal_600ca1ce168c9.pdfIn PDF document text
    • https://cdn.sqhk.co/vituxezij/cxhjgfF/cnc_router_parts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427104/normal_601c7f9b85eb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484365/normal_600f7475479c6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408195/normal_5fc6d35da9086.pdfIn PDF document text
    • http://sekelenogake.getenjoyment.net/19158241922.pdfIn PDF document text
    • https://cdn.sqhk.co/bewamufara/h7hiQy3/konuxiviwujodat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381988/normal_605dd19698759.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/62059360999.pdfIn PDF document text
    • https://cdn.sqhk.co/vogidasobe/ijii7Xf/emperor_and_beauties_game_mod_apk.pdfIn PDF document text
    • http://waparudadip.mywebcommunity.org/wamudubakejaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/filumabit/5gdNicu/terra_mystica_board_game_rules.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_601c6a78df7bc.pdfIn PDF document text
    • https://cdn.sqhk.co/zadexona/jhzTjac/wimugofabizuguzipivobu.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/ca9b3567-847d-4dbd-ac1d-a90e2e486e0b/bollinger_on_bollinger_bands_book.pdfIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_cc94ee011b874606af87fe8a4aec1071.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2bc5ead-51a1-4b5d-8828-8e0312945b61/sensus_water_meter_wiring_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d37948d-7b2f-4955-818b-a83dedd4a0e8/singer_model_4562_t_manual.pdfIn PDF document text
    • http://vefodipox.myartsonline.com/kudifaxezojev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2f103c0-4553-475e-a611-909baeb9719b/how_much_does_it_cost_to_replace_a_timing_chain_on_a_ford_explorer.pdfIn PDF document text
    • https://6974b9b2-fc2a-4e9b-9495-84ff65489eb7.filesusr.com/ugd/395280_42b389d49543418ab9e3c67148653049.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3f697f9-9c63-47f7-8d47-34e02849654b/niv_bible_app_with_audio.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_off000132ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CA 5620 bytes
SHA-256: f82bb096ab636b472461ea197580a57d065ceb2389a4b9076e598c4a1238372c
font_01_sfnt_off000145f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F0 11152 bytes
SHA-256: 8465423b47149d9363e7106cffdb92e720f343387a2f4200f218286324333b8c

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