Malicious PDF — malware analysis report

Static analysis result for SHA-256 683cd625e7061fba…

MALICIOUS

PDF

85.8 KB Created: 2021-04-04 22:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1055808f8f8fb7d0a9e5462db913a756 SHA-1: 0a02456195d26867ae5e9b22c3297c22f5f6d2ef SHA-256: 683cd625e7061fbaca1861b1d98173135a1ccf33e1dbdbce9659ae7e4ec8a99c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a lure for 'Asphalt 8 highly compressed mod'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting a phishing or scam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/123?utm_term=asphalt+8+highly+compressed+mod PDF link annotation
    • http://bawimip.sportsontheweb.net/tofamajowosiwa.pdfIn PDF document text
    • http://misifebofol.mywebcommunity.org/abrsm_grade_5_theory_2020.pdfIn PDF document text
    • https://lulujazopo.weebly.com/uploads/1/3/4/7/134769354/911860d7f20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470828/normal_603b4d9edcaca.pdfIn PDF document text
    • https://xeludelibiw.weebly.com/uploads/1/3/4/3/134371965/6128049.pdfIn PDF document text
    • https://xefulexemifin.weebly.com/uploads/1/3/1/3/131398452/zifugevugivufokatil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465270/normal_603fb874d6258.pdfIn PDF document text
    • https://katodelof.weebly.com/uploads/1/3/6/0/136051175/ce79e.pdfIn PDF document text
    • https://gugajapu.weebly.com/uploads/1/3/5/3/135330564/3377625.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421050/normal_5fc9aca8548b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jujuletofu.onlinewebshop.net/modelo_atomico_de_dalton.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf8a0ca-f54b-413b-ab97-3e34c917ee41/pocket_primary_care_pocket_notebook_series.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/likazedigagovawafuwepuxam.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/sasimeravoboparijiropil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7c08d6c-e1e4-4456-ab27-fc601b03d029/best_blendtec_jar_for_flour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/629ef44e-9ecd-4795-8ac7-217baa9a9531/61839190916.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/liwuwogexijogexuxut.pdfIn PDF document text
    • https://677e6977-fc43-48b2-ac81-16e478c8573b.filesusr.com/ugd/3750c2_865f0f96027e446e9a8fe725277715f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gomaxod/braun_thermoscan_7_irt_6520_chemist_warehouse.pdfIn PDF document text
    • http://wutesejib.onlinewebshop.net/39935724807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/327cb736-c50a-4868-a5a2-878e0d7a0f38/tobajagurimefusoda.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/beautiful_disaster_book_quotes.pdfIn PDF document text
    • https://901b9152-9067-49c5-8541-bb90c1a77dfa.filesusr.com/ugd/5d84e8_1fc2a229139049bfa0a162369b0118b5.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 5772 bytes
SHA-256: 92f003c64e7a5e210d60c42f23d0dad5c277b75aeb94f7029974f0a0cdb1ec09
font_01_sfnt_off000107d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D4 10740 bytes
SHA-256: b2ca7370b855894bcd4e3708110d0cd9e04bd93cfcf41647ffa22c6e99f22ee0
font_02_sfnt_off00012c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C82 18304 bytes
SHA-256: f3d8e898bb09c0c55a221c834d63463c33ec48bc876966e632de85b2677d2856