Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e702dbeccfdfd8…

MALICIOUS

PDF

73.8 KB Created: 2021-03-17 20:29:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c9740fdc5c088993f3282930247f8240 SHA-1: bb773529657305ff64b641ce84afb97a043135a3 SHA-256: 75e702dbeccfdfd80e6ad8a168d6890633f92ca4b2bbbc53bea092baa6edc471
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous external PDF links, including one pointing to a potential phishing lure hosted on 'ponafet.ru'. The document body is heavily obfuscated, but the presence of external links and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=politics+of+jesus+obery+hendricks PDF link annotation
    • https://cdn.sqhk.co/mesafovojifo/8jb5MLq/splash_pro_liquid_wallpaper_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445340/normal_600bb6948f90f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_5fd79edac9556.pdfIn PDF document text
    • https://kufojomarolov.weebly.com/uploads/1/3/4/4/134401526/temivilusijuj-rejobevuj-vilujuvi.pdfIn PDF document text
    • https://cdn.sqhk.co/jagojixego/ThgqFva/kexeje.pdfIn PDF document text
    • https://zopupafi.weebly.com/uploads/1/3/1/4/131454349/sowotomofido-razulalivasuxep-runeme.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ragejufa/fugebujujanodipoporefik.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/zupuzofolukuvafitaleg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63166848-4787-443a-9608-e2d185ae277c/jolasiba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b72ae0c-85a7-4e2a-8b9c-8b2362d937cf/60592804569.pdfIn PDF document text
    • https://7e6b698e-d56f-4a21-8c48-787e2f6d39f4.filesusr.com/ugd/7836c9_94406dfd10714dcdb29a18c01cd9fd27.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f56f4e3-067d-4e70-9d30-72c9ea262d3e/ninja_blender_1500w_how_to_use.pdfIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_109f4c15be7a4e3c804db16510759e73.pdf?index=trueIn PDF document text
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_f0045ed22905464fbc6a8429854b25d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/makkar_ielts_writing_task_2_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/despues_de_las_clases_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a6ecf40-b6bf-4df0-9e04-22c1450dd5aa/what_is_social_constructionist_epistemology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/665f1c99-1f56-460a-8370-3306214edfe1/volver_al_amor_marianne_williamson_frases.pdfIn PDF document text
    • https://s3.amazonaws.com/zuvovoxigumuz/how_does_the_easy_way_to_quit_smoking_work.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_off0000e147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 5280 bytes
SHA-256: 5f3f0dd67cf61a38dbd2d64618e03807a1d2225fd17974acf7d5c609c8fd3c54
font_01_sfnt_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 10824 bytes
SHA-256: 28d2455b8bdbdb0cc420354ef3c1db4f026158978a45f7db94aeafca620f6943