Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8779c0ea92815da…

MALICIOUS

PDF

78.5 KB Created: 2021-05-11 08:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a80fd74ba45a73f2de0882eac49aa3a SHA-1: 9108aa3adcd30955aa3702ca0f00b3da4e81cf97 SHA-256: d8779c0ea92815da2a160bc0806615960d711d2fcc4fe032f8b98ed9953e5cd5
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'ponafet.ru', suggesting it functions as a lure to a phishing or malware distribution site. The document body, though heavily obfuscated, appears to contain calendar-related text, reinforcing the phishing lure. No scripts were extracted, but the presence of external URIs and the overall heuristic profile strongly suggest a phishing or downloader attack pattern.

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://ponafet.ru/strik?utm_term=calendario+escolar+2019+a+2020+sep+durango
    • http://bofitek.iblogger.org/44384163461.pdf
    • http://logekolumo.22web.org/census_2020_for_rbi_grade_b.pdf
    • http://parhelifrl.space/arabian_nights_ebook_freex5zuj.pdf
    • http://getchambre.xyz/characters_from_sir_gawain_and_the_green_knight_to_the_archetypes_they_represent7exrk.pdf
    • http://indonesia2health.online/adverb_of_time_place_and_manner_worksheetsbs2dk.pdf
    • http://liwugukikijosi.iblogger.org/fly_tying_bench_lamp.pdf
    • http://parrrtner.xyz/411915660mbk3u.pdf
    • http://1cats.space/bios_straty_selantesk2lcu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_fe5c27e9f5af4405a422b13f919fbec2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/35806ec7-473b-4f43-856b-9e0979b44f1d/jiwogi.pdf
    • http://residarifuwus.rf.gd/antivirus_android_samsung_s4.pdf
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_1094027768f84524bbfd7e8fc12fb61e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6d583095-8df6-401a-8191-8af34ffa31a0/fuzeputuberupix.pdf
    • https://827a6da4-a69c-4806-aaaa-db522494bc4d.filesusr.com/ugd/cb5916_4889ab9075fd49f09592526a492406a6.pdf?index=true
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_1e0b888d7fe14007bfa4b0ae127c9dfe.pdf?index=true
    • http://fijaxij.rf.gd/azorin_el_escritor.pdf
    • http://bexilonedatisud.epizy.com/23768077929.pdf
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_ef73f2f50c80439d96f99b06742f9fbd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/6a49ed5e-37da-4a3f-a721-a5d8b1038395/42012130514.pdf
    • http://sezipikoguzole.epizy.com/1141164097.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0bf.bin
d8feae7dc15051afbd04c6615525d5d502ca35c39fbf0390d49f25220dce2044		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 5628 bytes
font_01_sfnt_off000103ee.bin
abe95e7f12b749e2744a3cdb800d1e88a10e3912d8790bedd729d73bdee4158e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103EE 12556 bytes

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