Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3fb1ecc7072f0b…

MALICIOUS

PDF

84.4 KB Created: 2021-03-25 19:07:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ed5d7139ea0fd5c0aed407afde4cecbb SHA-1: 17a19704122765bd2da19ebd4006753ff016c699 SHA-256: 6d3fb1ecc7072f0beda4bffa1b4cdf068122efa8932ef18b910d5dd45ed4113e
184 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, indicating a high likelihood of malicious intent. It contains embedded links, one of which, 'https://yafferge.ru/123?utm_term=ctet+last+date+form+fill+2018', is identified as a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Ctet last date form fill 2018', likely to trick users into clicking the malicious link. No scripts were extracted, but the presence of malicious links and the overall classification strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=ctet+last+date+form+fill+2018 In PDF document text
    • http://everydayy.fun/73618605767gly1z.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/hQrgcha/baldi_s_basics_birthday_bash_mod_download.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/lobokewilusatexigo.pdfIn PDF document text
    • https://cdn.sqhk.co/gofuzurafano/2ePAgel/13961290214.pdfIn PDF document text
    • http://twitter-center.com/emtech_zm-_2mai1n.pdfIn PDF document text
    • http://liketime.online/best_schwinn_bike_for_seniorscvsr4.pdfIn PDF document text
    • http://lnstagramverifycentre.com/what_are_the_functions_of_modal_verbs_in_englishto2vj.pdfIn PDF document text
    • http://paksorond.xyz/acca_jobs_in_pakistan_armyj9ehf.pdfIn PDF document text
    • http://uanews.website/capture_the_flagwvsbz.pdfIn PDF document text
    • https://cdn.sqhk.co/kokojisip/JvicggF/loxagafuwanezoja.pdfIn PDF document text
    • http://vorecan.fun/7931068394575xrh.pdfIn PDF document text
    • http://namedaun.fun/computer_shortcut_key_in_hindi_download5kwon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_0cb30f4360094d23a79881a7af73e4e2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/verirejon/lazuviveg.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/bakugig.pdfIn PDF document text
    • http://todidetiped.onlinewebshop.net/82104120446.pdfIn PDF document text
    • https://efa91360-7c21-416c-9d60-3189e0beb381.filesusr.com/ugd/42ffc7_67b0d8ac0a954de5b80b6c816673e2d5.pdf?index=trueIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_1f9a2645bef3446ebbfece20c42e2f09.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/95294163109.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/94754333465.pdfIn PDF document text
    • https://8f6f9f04-f977-4239-955d-f6aecf2dd879.filesusr.com/ugd/81cd61_831e2e3bc5b34758b0b41b6236560338.pdf?index=trueIn PDF document text
    • https://e49cd12a-7e53-4a25-9f98-ae37b5ff2e44.filesusr.com/ugd/35dc59_2b804c87dad14943801b9577be9b8a4b.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 5480 bytes
SHA-256: 01c876f7ca00d626a329fdfb411e301f05fa21493d1a8afd4b3776dbc604b307
font_01_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 11740 bytes
SHA-256: 8d94dabb188375fefdb7873a2595cd54b6be40f606f8d735eba2cb94fa64fbf8
font_02_sfnt_off00012ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECD 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8