Malicious PDF — malware analysis report

Static analysis result for SHA-256 99454848d48827de…

MALICIOUS

PDF

76.7 KB Created: 2021-03-21 22:28:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f40c071399ccbc328ca3e55fb402316a SHA-1: 00750bf22e1e419a0914397565a84ee6a1ecfb59 SHA-256: 99454848d48827de56676e41064c862141dc713361d00fc33f65d35a3768c3be
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, many of which are flagged as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and link farm heuristics suggests the document's primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/123?utm_term=uniform+cost+search+in+java PDF link annotation
    • http://noviviludizafim.iblogger.org/dyson_big_ball_multi_floor_2_vacuum_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/wavagowew/Q1jgeic/antenna_nptel.pdfIn PDF document text
    • http://specialsale.info/602639647672ujpu.pdfIn PDF document text
    • http://gufutaca6.xyz/harry_potter_book_series_authord7u0s.pdfIn PDF document text
    • http://cookwellbakewell.com/zodurateqi0.pdfIn PDF document text
    • http://fovejawurolugaf.iblogger.org/75791663933.pdfIn PDF document text
    • https://cdn.sqhk.co/doxanusubomo/cjhUXjb/rusajiwodabilumoz.pdfIn PDF document text
    • http://moscow-siberian-force.online/mowirizmvbjr.pdfIn PDF document text
    • http://hook-up.fun/catalogue_marjane_juin_2020em7zz.pdfIn PDF document text
    • http://hellesypakk.online/9736446699wp9mm.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/nhbTje7/femojegipunikerejelore.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
    • https://s3.amazonaws.com/gonafoziguwewe/how_to_work_cited_website_mla_format.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/aloha_browser_failed.pdfIn PDF document text
    • http://fivexuto.rf.gd/agneepath_songs_free_in_masstamilan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b34a841-3320-4a5b-9b20-5d938b0588bb/dabixaxot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4c21a1a-5eca-4d4d-ab29-1a33b211362c/90778532440.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_off0000e0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 5004 bytes
SHA-256: e3a9322c7514074b09d5ec82ef43daf4e16c235f32b7d3b7e16c34a878377bd6
font_01_sfnt_off0000f1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B5 11192 bytes
SHA-256: c0908c228638b8d09a14aa9ec598cd67e44106c199744ed3726e2b31cc4ef137
font_02_sfnt_off000117e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E8 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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