Malicious PDF — malware analysis report

Static analysis result for SHA-256 8919583a925a67af…

MALICIOUS

PDF

77.2 KB Created: 2021-05-01 01:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4a3f16a100f4004cf6dafa87304fa87d SHA-1: b83e0e0aa9d60d01a7b0f8ee0108b77ec7f7d452 SHA-256: 8919583a925a67afcb54d861cdf946dc01959c27e423f0f31f567bbe8af75dfc
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The document contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://druttle.ru/strik?utm_term=how+does+a+man%2527s+brain+work PDF link annotation
    • https://vawudida.weebly.com/uploads/1/3/4/8/134890241/migux.pdfIn PDF document text
    • https://gakefutafo.weebly.com/uploads/1/3/0/7/130739004/36eb7c641fe7e50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420767/normal_5fe98f40e36f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465688/normal_603e28b8a83fa.pdfIn PDF document text
    • http://fijexojor.getenjoyment.net/13286119636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446774/normal_601a5a6882dac.pdfIn PDF document text
    • http://kilekapalovuzo.getenjoyment.net/87102710658.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460449/normal_5fec9e835043a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390638/normal_6061f1c11b876.pdfIn PDF document text
    • https://kunudixi.weebly.com/uploads/1/3/4/6/134667289/3442233.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_bb62fa393c534b669277b757fad41465.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_2a890e1bbbd44568aed8eadf971b4011.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/77f78488-987c-41b1-960a-f3721e35842b/35051439059.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/how_to_connect_hp_envy_4500_printer_to_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72d4ce67-3841-4bb0-b4b0-af58aee9b43c/what_kidde_smoke_detectors_are_being_recalled.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3f2c5e4-21c8-4462-a8db-11b96b82b214/tewuvuturapuwutegemekalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8468563-fac5-4c7f-9fc0-7abecf16e7de/39466301330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99e0d98f-62c9-44dd-83a6-79479a145d6a/2020_lds_youth_theme_song_sheet_music.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/37340589088.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/newofumagutotatuka.pdfIn PDF document text
    • http://resilasijajatil.myartsonline.com/journey_to_the_center_of_the_earth_2.pdfIn PDF document text
    • http://pitaken.onlinewebshop.net/wewiburadezatawis.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/lupizefejuruliwamew.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/anemia_in_pregnancy_ppt_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/kewimomomonibugiworiferij.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_off0000f183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF183 5228 bytes
SHA-256: 54098c1c721dba80c32c9765831d7dc8a2c56b80ce8c0117fd9d3afef445a1d4
font_01_sfnt_off00010348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10348 10608 bytes
SHA-256: b0d564e02eeab04eadd0ab6876bd537adc0931c2c05adcebee1ec4f5bce47737