Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be510f844bcbf17…

MALICIOUS

PDF

70.7 KB Created: 2021-03-14 09:58:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37d0d8710dce67b07194b013dd11d928 SHA-1: ada0e9f469247800522ec7da38e8fd6a2e3b567d SHA-256: 1be510f844bcbf173418685d932585c7780bae95fd0fc077ad6323358a3da5f7
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The embedded URL 'https://vilenefex.ru/123?utm_term=cambridge+english+worksheets+for+grade+3' is particularly suspicious, indicating a lure for educational content to redirect users to a malicious site. No scripts were extracted, but the PDF structure and numerous external links strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://vilenefex.ru/123?utm_term=cambridge+english+worksheets+for+grade+3
    • https://sibanozaniso.weebly.com/uploads/1/3/4/8/134858677/66935735b0b.pdf
    • https://xuvelufuxilo.weebly.com/uploads/1/3/5/3/135387868/tisuxifexofet.pdf
    • http://xodikiz.iblogger.org/nenuzitogo.pdf
    • https://wuwilosuz.weebly.com/uploads/1/3/4/3/134394730/botavozavafekidel.pdf
    • https://sisekiki.weebly.com/uploads/1/3/4/6/134622657/992902.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tapavakagazu.epizy.com/grundfos_alpha2_15-_60_user_guide.pdf
    • https://s3.amazonaws.com/zamemigojat/bsf_tradesman_recruitment_2019_application_form.pdf
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_2192a5e8f7bb488184b0672783194d84.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8f772310-89a6-4095-bf43-7acb4c6c355c/96296778930.pdf
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_ec3f5418a2444c3aa4fa12e47ed4e3e1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0157aeab-e0ef-4e59-96cc-7a301f83f961/42404982820.pdf
    • https://s3.amazonaws.com/xukirizugukugi/install_fios_home_router_g3100.pdf
    • https://uploads.strikinglycdn.com/files/f15ae21e-90b2-4196-ad9f-3a817438be07/nespresso_vertuoline_exit_descaling_mode.pdf
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_ea314c0c4e4c4f2b95f70bba2587df70.pdf?index=true
    • http://zigonetisakep.epizy.com/list_of_root_words_in_english.pdf
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_b2f2fb8190004a71bcf9fe0249ef0e63.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d2fcc9bd-afd8-49b0-8f59-e875c92a813b/does_the_subaru_outback_have_a_6_cylinder_engine.pdf
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_336df6d65849499a93e8d3d6472f18c6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/afae1578-4e56-48ab-9c1a-1de010b4f101/depovitafaruwebetuvoji.pdf
    • https://uploads.strikinglycdn.com/files/bbb084e3-7d10-4822-b267-a254903c4a96/what_is_4_p.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_off0000d322.bin
4ea1bddddf60315c8a7df968ad7d21e33f01c3c005589bb7ec74c6d059239846		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD322 5688 bytes
font_01_sfnt_off0000e662.bin
b81cbb17ede82307ed947297e99ab96aa96761199b8d60fb6918a58297b315a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 11488 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.