Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a20491c3a6afaed…

MALICIOUS

PDF

72.4 KB Created: 2021-03-30 01:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 257ecd747269836ba2fe25007ab66466 SHA-1: 7b7395a587de476873debe1f7d747801e72c48f4 SHA-256: 7a20491c3a6afaedb3533d613215d15c3e3ab504e9df24394f7a8be9c7c7202a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, including those on disposable hosting and redirectors, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to a 'Riello burner handbook' and 'wkhtmltopdf', which may be part of a lure to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://botokaw.ru/strik?utm_term=riello+burner+handbook
    • https://waxajevigeko.weebly.com/uploads/1/3/1/4/131453715/sulipenar_xarul_zoribobodeworuk_jolax.pdf
    • https://limejanokevipa.weebly.com/uploads/1/3/0/7/130739330/2864331.pdf
    • http://martakkord.ru/boliyan_song_jass_sanghamw8y2.pdf
    • https://webunufilijamo.weebly.com/uploads/1/3/4/6/134677486/79058.pdf
    • https://cdn.sqhk.co/tumowara/N9jdugZ/at_t_mobile_transfer_app_android_to_iphone.pdf
    • https://cdn.sqhk.co/lakekomum/UthfjcY/flights_to_puerto_rico.pdf
    • https://cdn-cms.f-static.net/uploads/4457847/normal_6055699ccedba.pdf
    • https://cdn.sqhk.co/libobivole/icDXidr/26661327521.pdf
    • https://dexuganepo.weebly.com/uploads/1/3/1/6/131608037/341c0.pdf
    • https://cdn-cms.f-static.net/uploads/4500183/normal_601244de44916.pdf
    • http://xplaintome.ru/batch_convert_docx_to1ry1n.pdf
    • https://mupililoxer.weebly.com/uploads/1/3/5/3/135302313/sowoxoxafaraxexuw.pdf
    • https://cdn.sqhk.co/ruxodinumoro/jaUQLgO/top_popular_ringtones_2020_free_download.pdf
    • http://kemijejanurag.iblogger.org/35366380404.pdf
    • http://salonop.xyz/jizozzqfff.pdf
    • https://cdn.sqhk.co/sativomofij/cgikviA/project_costing_template_in_excel.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://tasoged.epizy.com/is_it_possible_to_install_windows_10_on_a_chromebook.pdf
    • https://s3.amazonaws.com/tofizo/march_2019_us_sat_answers.pdf
    • http://kukalawewo.epizy.com/34723384989.pdf
    • https://s3.amazonaws.com/jopomodilamego/greater_than_less_than_maths_worksheets.pdf
    • https://s3.amazonaws.com/ponivotigegepub/84901649552.pdf
    • https://s3.amazonaws.com/bulujono/honeywell_commercial_thermostat_how_to_unlock_screen.pdf
    • http://kedokonox.rf.gd/free_organizational_charts_templates_online.pdf
    • https://s3.amazonaws.com/tinajabizoreguf/pereti.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d49b.bin
1702657e30a429fa0c7209aeb0a0dd5bfeb566d337d2c4deaa5f75cf6fe7bdbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD49B 4748 bytes
font_01_sfnt_off0000e497.bin
10d58d737906bf0d6800ca8e108d23040c1c2e04ef15626a3b48a055c5759288		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE497 9884 bytes
font_02_sfnt_off00010620.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10620 4324 bytes

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