Malicious PDF — malware analysis report

Static analysis result for SHA-256 71190db121fd0aab…

MALICIOUS

PDF

129.2 KB Created: 2021-02-11 19:56:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c76fcaccd4baf89f980c9a47e22db5a1 SHA-1: 170b518b4bdf5c138b455a4b65c32ec731f1ff22 SHA-256: 71190db121fd0aab5359443f90de81eda37e733efcde1d76264e59669ab8b6e9
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit user interaction to navigate to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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=monokuma%2527s+test+guide In PDF document text
    • http://ndfnasg.xyz/ml_for_the_working_programmer6d59c.pdfIn PDF document text
    • http://gididowofugu.iblogger.org/lupezivoraloliwif.pdfIn PDF document text
    • http://getbuiss.online/unit_1_dictionary_geometry_basics_worksheettjs2w.pdfIn PDF document text
    • http://remebetegekit.iblogger.org/4113332824.pdfIn PDF document text
    • http://xavelodezazil.iblogger.org/95776075051.pdfIn PDF document text
    • http://maletewidulebil.iblogger.org/lusufukijapazevezisapowas.pdfIn PDF document text
    • http://carluxepaint.site/givovivozusunobixi07c4k.pdfIn PDF document text
    • http://rrrrkkkkk.space/ted_lasso_trailer_youtube477rn.pdfIn PDF document text
    • http://matrixbicycles.com/instagram_gain_followers_app_202092dst.pdfIn PDF document text
    • http://hookup754.fun/vaikom_muhammad_basheer_stories_in_malayalam_free_downloadk80xi.pdfIn PDF document text
    • http://avto-trokot.xyz/puzuxukuwe3zjee.pdfIn PDF document text
    • http://gosetapuk.22web.org/lawakedemonuxotobijegowew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuniguvip.epizy.com/xojogopobejujifikukuxil.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/dajofozusuworiz.pdfIn PDF document text
    • http://lavavoju.rf.gd/fusemebimevew.pdfIn PDF document text
    • http://virawumeritaxo.rf.gd/29401726550.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/fairfields_primary_school_uniform.pdfIn PDF document text
    • http://rilefup.epizy.com/nebudevaga.pdfIn PDF document text
    • http://wepinipinalojud.epizy.com/raxakob.pdfIn PDF document text
    • http://liwumulexajuvi.epizy.com/minexid.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/44411666189.pdfIn PDF document text
    • http://lajirobodogew.epizy.com/cholecalciferol_davis_drug_guide.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001c869.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C869 24672 bytes
SHA-256: f84225e83f4e3c8b4713554a319d7532843a3a3e4a70548fae0ab59bbf564d68
font_00_sfnt_off00017c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C1B 6052 bytes
SHA-256: 620c444a36e4551ea0c343010a53830dae8862773e6ca75256c1296b40c9626f
font_01_sfnt_off00019103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19103 5120 bytes
SHA-256: 890702f70ca8759052fa5f2ed6427fef082c8e07c585dd4111ff8a97476a62e1
font_02_sfnt_off0001a270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A270 11408 bytes
SHA-256: 5a08e3fe24a9978658042c4992469f1478699edcd58909238f0c4765a8824f72