Malicious PDF — malware analysis report

Static analysis result for SHA-256 e816595273add327…

MALICIOUS

PDF

78.8 KB Created: 2021-06-01 03:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 944866ae4365a57d796640cf66cfcc3a SHA-1: d553c9cd6f710370a28540eef77884ed7df18b26 SHA-256: e816595273add32791daea5284ebb8395e7f6f54526da977927922459a3a983e
194 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or redirection scheme. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/123?utm_term=indesign+table+styles+templates++free
    • https://cdn-cms.f-static.net/uploads/4413845/normal_601660029f97c.pdf
    • https://sejomuxajifaged.weebly.com/uploads/1/3/1/4/131437693/tilamugedawigigab.pdf
    • https://fefugenaxidoseb.weebly.com/uploads/1/3/1/3/131380158/3911408.pdf
    • https://numesenara.weebly.com/uploads/1/3/1/0/131069843/603027.pdf
    • https://reborugavuzak.weebly.com/uploads/1/3/4/7/134736286/7683089.pdf
    • https://senuwisaf.weebly.com/uploads/1/3/4/0/134018119/wuvapuw_ziguv_lezamonipifu_ripijokepu.pdf
    • https://didowaxa.weebly.com/uploads/1/3/4/3/134387091/vidibewiwazaredomi.pdf
    • https://repadugudemi.weebly.com/uploads/1/3/0/9/130969496/pofukuvadoxadud.pdf
    • https://static.s123-cdn-static-d.com/uploads/4493541/normal_60b062088dbe3.pdf
    • https://cdn-cms.f-static.net/uploads/4370767/normal_601b1ee5b858a.pdf
    • https://tefimapotile.weebly.com/uploads/1/3/4/3/134351392/f78cd1e37a0.pdf
    • https://dexeputurad.weebly.com/uploads/1/3/4/8/134878817/vexotefukukixen.pdf
    • https://fuwiposodunumof.weebly.com/uploads/1/3/1/4/131438128/sagelukeraselo_votevu_volokagetidabi_dafexejevu.pdf
    • https://totidulabi.weebly.com/uploads/1/3/1/6/131606487/wobiga.pdf
    • https://cdn-cms.f-static.net/uploads/4494435/normal_603d19cfd7bfa.pdf
    • https://static.s123-cdn-static.com/uploads/4373526/normal_5fef7cb68a441.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sewafebi.pbworks.com/f/20678196878.pdf
    • http://wozixokumo.pbworks.com/f/47078369440.pdf
    • https://uploads.strikinglycdn.com/files/8ae42cf6-52d4-4624-b762-a8080bdbde5f/what_do_indian_navy_officers_do.pdf
    • https://uploads.strikinglycdn.com/files/03bd71fb-a33a-4ec4-ae06-d5127a37923e/personal_development_plan_template_word_document.pdf
    • https://uploads.strikinglycdn.com/files/af0555bd-20c2-4bd1-a2c6-d91641ab1c47/jimozupiwoziginut.pdf
    • 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_off0000f491.bin
b90658eed899638761b312b029337ab1a4a3925cec6024415cebe2ead0f22eba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 5540 bytes
font_01_sfnt_off00010759.bin
598361464a46dac3ccca2298b99e32a02b78b757e0d62e03b8676d42fd0ec1ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 10988 bytes

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