Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cd464977d9b9c8…

MALICIOUS

PDF

81.4 KB Created: 2021-03-30 20:03:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 31ca2bba57ee2c6f12db711eadbb596a SHA-1: e684fd7e2c55ba86e58e8dfddb715156ae9c4256 SHA-256: 65cd464977d9b9c8f3df72fdcee42b4e9b74a2db39de29a0122416f5eeb7c7e7
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a ML classifier and ClamAV, and contains a link to known malicious redirector infrastructure. The presence of a 'download button' heuristic suggests a lure to trick the user into clicking the malicious link. The document body is heavily obfuscated, but the presence of a URL with a 'utm_term' parameter indicates a potential phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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
  • 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://dafemum.ru/123?utm_term=cavernous+sinus+thrombosis+case+report In PDF document text
    • http://artelamp.store/44797431834jj0y5.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/pdf_reducer_mac.pdfIn PDF document text
    • http://jobs-ingenieur.best/city_gangs_san_andreast67ad.pdfIn PDF document text
    • http://tinubawolu.mywebcommunity.org/2020_calendar.pdfIn PDF document text
    • http://oneitstore.info/sodivuwolowejozekenap4hh4.pdfIn PDF document text
    • http://pawezujexas.mywebcommunity.org/adobe_photoshop_7.0_tutorials_photo_effects.pdfIn PDF document text
    • http://bapozuwemixad.22web.org/pipolokedoriporowazi.pdfIn PDF document text
    • http://kadaxejob.mypressonline.com/african_american_inventors_book.pdfIn PDF document text
    • http://rostov-mobile-doctor.ru/viwasimutal7tu33.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/how_to_make_an_obstacle_avoiding_arduino_robot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0b78381-349e-4c98-a020-4bd038a30897/factor_the_common_factor_out_of_each_expression_worksheet_algebra_1.pdfIn PDF document text
    • http://birukuf.onlinewebshop.net/tanififizagokalomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05ac815f-6769-496c-8c9e-4b1c5c598449/nutewutemul.pdfIn PDF document text
    • http://muvemaxadal.onlinewebshop.net/piboxi.pdfIn PDF document text
    • http://mevusajilitum.rf.gd/38651657234.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/79267100638.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/14468566415.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af60c072-ee38-40ed-baf3-1fb41537490f/what_is_a_neo_gothic_church.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/kingdom_man_tony_evans_movie.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/juferadunokisa.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/doterasitegorupul.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10276 5248 bytes
SHA-256: 1f8ec6f2a8e58cccfaeb848962c7313e51e7cd942121b0fc9872fd1ee58ee788
font_01_sfnt_off00011423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11423 10536 bytes
SHA-256: 80ecbf0465965221582dc7fdd641ddc33c8e34864e274723817d5c6e3b4571fe

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