Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28b9c8dcf1af272…

MALICIOUS

PDF

77.2 KB Created: 2021-06-10 00:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9002e668600f8633dddf0d7f3dc8ab0d SHA-1: d29bd8df5317571c4f598c1da69af5ddd48271ed SHA-256: f28b9c8dcf1af272282d458c2544d8ed8c1544da09905c1f7238ef5769ec1290
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, which is characteristic of phishing or malware distribution campaigns. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a tactic to obscure the true malicious destination. No scripts were extracted, but the presence of multiple external URIs suggests the document's primary function is to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://chcial.ru/pbw?utm_term=hyperbola+word+problems+with+solutions+pdf PDF link annotation
    • https://zulozuger.weebly.com/uploads/1/3/5/3/135310252/zewepejotumakemi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367947/normal_5fde252112904.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416299/normal_6044931c1584e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452626/normal_5fdc67237d640.pdfIn PDF document text
    • https://tojezupemizeraw.weebly.com/uploads/1/3/4/6/134629845/giwobifiliri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487888/normal_604dceeca3565.pdfIn PDF document text
    • https://vipeketiduwe.weebly.com/uploads/1/3/1/6/131636725/c1e9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461495/normal_5fc68a0dd489b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380068/normal_600df1e3d42c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502819/normal_5fe7857e984f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386605/normal_6007a91d517bb.pdfIn PDF document text
    • https://binolopokam.weebly.com/uploads/1/3/1/4/131484395/mudekivebibi.pdfIn PDF document text
    • https://zemotererozo.weebly.com/uploads/1/3/0/7/130738962/362683.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483346/normal_5fe5981e013f9.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://nudifimixonu.pbworks.com/f/ppsspp_football_games_2020_download.pdfIn PDF document text
    • http://jujupaw.pbworks.com/f/amman_devotional_songs_tamil_free_download_tamilwire.pdfIn PDF document text
    • http://fuvesiwowegu.pbworks.com/w/file/fetch/144413505/zuma_deluxe_full_version_download_and_install_free.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/w/file/fetch/144443001/personajes_principales_y_secundarios_de_la_obra_metamorfosis_de_franz_kafka.pdfIn PDF document text
    • http://masawumel.pbworks.com/w/file/fetch/144420318/33046758002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/130969db-1672-4648-b655-e6fcf99a7b24/83147618693.pdfIn PDF document text
    • http://kimotamiju.pbworks.com/f/29698239313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/013b64c7-54d6-4747-af33-f191cf11ec04/35658586565.pdfIn PDF document text
    • http://nusometa.pbworks.com/f/fake_gps_joystick_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa2f59c7-cd91-4430-8d0a-563fad2eb770/8195930322.pdfIn PDF document text
    • http://gonikob.pbworks.com/f/how_to_get_riot_points_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc4cf937-9348-4272-8780-622f084ec374/togabatidaj.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_off0000e0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 5456 bytes
SHA-256: 51f23379fd89f4d363fbcdf47b264978493ba28d03df003a312efa71e69a247b
font_01_sfnt_off0000f323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF323 10908 bytes
SHA-256: 90a27c2467e81fa3c1937df32d808f37366e37cb29fe3af79826c99162098af0
font_02_sfnt_off0001189b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189B 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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