Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22ad1995c90c323…

MALICIOUS

PDF

73.1 KB Created: 2021-03-18 05:31:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0e19f4c4eae3a4bc6b65edc0a40b056f SHA-1: c71e54463fde5ff4c3334d5e3045cd03d6a28c11 SHA-256: d22ad1995c90c32320f30c272ea64a0374b451f5c41a3cf030e4f8ce306abba5
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains embedded URLs that redirect to external websites, likely for phishing purposes. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, common in phishing campaigns. No scripts were extracted, but the PDF structure itself facilitates the attack by presenting links.

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://resalured.ru/award?keyword=big+ideas+math+advanced+1+pdf PDF link annotation
    • https://wukugisusip.weebly.com/uploads/1/3/2/6/132695501/9533572.pdfIn PDF document text
    • https://rawabupabazokiz.weebly.com/uploads/1/3/2/6/132695668/5722649.pdfIn PDF document text
    • http://lefuvaguvupawax.iblogger.org/arrow_cursor_icon.pdfIn PDF document text
    • http://tomokatixo.mygamesonline.org/wefatedotajuxidewogoxenak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_5fe6e97bd9350.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391624/normal_602fbd5a612a3.pdfIn PDF document text
    • http://tisiner.iblogger.org/android_store_value_in_sharedpreferences.pdfIn PDF document text
    • https://senorori.weebly.com/uploads/1/3/4/6/134641151/c568d6.pdfIn PDF document text
    • http://nakotigolajeg.scienceontheweb.net/diccionario_enciclopedico_de_derecho_usual_cabanellas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_767d280c843e42b69c66cd328f35510d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/63949976949.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/nosope.pdfIn PDF document text
    • http://satuzolo.epizy.com/how_to_draw_realistic_portraits_step_by_step_for_beginners.pdfIn PDF document text
    • http://niwimugosaz.onlinewebshop.net/big_fish_games_pc_download_windows_7.pdfIn PDF document text
    • http://medipebep.rf.gd/67415124804.pdfIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_8012d06cfc5a4f7684bf729e9084c73f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/golepe/radotuzosogakazusode.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_off0000e02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 5600 bytes
SHA-256: 8aa806840a52d723e9475a71ab4aff66bfcd7fbde4423166e70be5ddf5f0a546
font_01_sfnt_off0000f32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32E 10692 bytes
SHA-256: 490ff5a43515b8bc5de58155740ff1a6cb7cb94328d2d1b06f8a7636aa1af3ff

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