Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e3786a0a5d292c…

MALICIOUS

PDF

74.3 KB Created: 2021-04-03 12:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1f17200c8c817bc0f7ca823874152c9 SHA-1: a7cd9a2f682a45cf482c364023228834984b2bdc SHA-256: 41e3786a0a5d292ca4129ae1cda3a47a076735abf738abef870b36fb505f0534
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document designed to redirect users to potentially harmful websites, likely for phishing or ad fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://lozipotod.ru/aws?utm_term=how+to+adjust+daylight+savings+on+g+shock
    • https://cdn-cms.f-static.net/uploads/4413455/normal_6065a0a3864b0.pdf
    • https://takaranedo.weebly.com/uploads/1/3/4/0/134017801/2085285.pdf
    • https://woliwejimagevin.weebly.com/uploads/1/3/4/3/134319070/foganoxedegifa_siduvefi.pdf
    • https://cdn-cms.f-static.net/uploads/4485010/normal_6016f803ad2fd.pdf
    • https://mamasikixatok.weebly.com/uploads/1/3/5/9/135961158/4698313.pdf
    • http://urro-hu.com/how_much_does_a_freightliner_costar0xn.pdf
    • http://mkuu.club/gopikotafekodoselugih8i7.pdf
    • http://trynon.xyz/bsf_questions_and_answers_lesson_25_day_3uyx10.pdf
    • https://duresanu.weebly.com/uploads/1/3/5/3/135334900/b54d0365ce5.pdf
    • https://static.s123-cdn-static.com/uploads/4413117/normal_5fec1d38a1d94.pdf
    • http://giocodigital.website/lexis_audio_editor_premium_apk74wks.pdf
    • http://twoup-viktoria.online/novibewavusizqsuym.pdf
    • https://tedawubav.weebly.com/uploads/1/3/4/3/134376018/888a0ea1e.pdf
    • https://jovegubegatok.weebly.com/uploads/1/3/5/3/135318826/93eb8b24.pdf
    • https://nokemodikobo.weebly.com/uploads/1/3/4/3/134308311/zesagoz-matumoxe.pdf
    • https://najoduvojubowi.weebly.com/uploads/1/3/2/8/132815002/mebig_bubulata_zawosiluva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xebuvuwov/zufodurokivojejinu.pdf
    • https://s3.amazonaws.com/xidazeze/18385708857.pdf
    • https://s3.amazonaws.com/rawesaragegugar/motorola_apx_6000_mic_and_earpiece.pdf
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_eeba261314fb438697a9b04d24498535.pdf?index=true
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_c3863712ef704abcb7be07ca23dc265c.pdf?index=true
    • 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_off0000e5e4.bin
16f972b12c2189c7d5dcde3be2e4f609196c4c41935f3a715b017fbf99f8aa84		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E4 5460 bytes
font_01_sfnt_off0000f899.bin
1ca72def982c5cd4c663a9884b71a1a51eda68447f24f2f7b1e70d99ed995ddc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 10268 bytes

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