Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd62ac33a4f2ef7…

MALICIOUS

PDF

71.3 KB Created: 2021-04-07 05:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b7d1f11c11a9609220f4ab1c7a6758f4 SHA-1: 70a70cd563a5f6235e1ab50139ade28f9e241b40 SHA-256: abd62ac33a4f2ef76e54addb32b7721d854009f493807eacd17ae52a052f4e4b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • 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://golowaki.ru/strik?utm_term=plan+y+programa+de+estudio+2011+sexto+grado+matematicas PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4373281/normal_5fe22eae726e3.pdfIn PDF document text
    • https://petozuxelilaf.weebly.com/uploads/1/3/4/2/134265439/lemovenisonox-jawiramo-zutilufutav.pdfIn PDF document text
    • http://sivolejujivozul.scienceontheweb.net/gabawumepodaji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465277/normal_606a2165a2dde.pdfIn PDF document text
    • http://zujoxuxosaja.getenjoyment.net/cyclical_theory_of_social_change.pdfIn PDF document text
    • http://kuboduzuke.mypressonline.com/xabivivujitoge.pdfIn PDF document text
    • http://kositexujir.sportsontheweb.net/44709963551.pdfIn PDF document text
    • https://pibulibeles.weebly.com/uploads/1/3/5/3/135324177/4071119.pdfIn PDF document text
    • https://gavurudujugewi.weebly.com/uploads/1/3/4/3/134361378/nomokenixavonuse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422377/normal_60355b9e6ebf7.pdfIn PDF document text
    • https://rudadikisoma.weebly.com/uploads/1/3/1/6/131606677/boresudozuxazonulo.pdfIn PDF document text
    • https://rulamajovag.weebly.com/uploads/1/3/4/7/134764486/kokamutazil.pdfIn PDF document text
    • http://dikagowoxi.sportsontheweb.net/19330073538.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/quantitative_analysis_of_market_data_a_primer.pdfIn PDF document text
    • http://vaxenovutejuzid.sportsontheweb.net/writing_equations_in_slope_intercept_form_word_problems.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_998fdfb99b144a40a66db410e5b3f2b4.pdf?index=trueIn PDF document text
    • https://fb3efafe-1b0e-41a1-9434-8bf556110c4a.filesusr.com/ugd/de5e41_5e21aef13fa24be18053b723070cd555.pdf?index=trueIn PDF document text
    • https://43fe4710-460a-4ad3-90dc-2dd795c51528.filesusr.com/ugd/a32c20_1f925f7cbf9e4768889458de3a845af7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/61571395482.pdfIn PDF document text
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_4419fc593a7447e8bf951fd20bae2b00.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woneketelak/xovokomagukizigalud.pdfIn PDF document text
    • https://cd9ed9ec-87d1-42be-9198-0b2de6c1db4d.filesusr.com/ugd/158fb9_9a9568547cc04b688dfdf440fd76f539.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/zuvaxomavovujojojudo.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/bafunil.pdfIn PDF document text
    • http://tobikinos.onlinewebshop.net/add_text_to_txt_file_python.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/eyes_of_the_stone_thief_5e.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_off0000d6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F6 5892 bytes
SHA-256: 5c1650455ea31ac10c8151ce41a954a9b8e8b2d45cf2f2201f6497f89ecc8f75
font_01_sfnt_off0000eb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 10372 bytes
SHA-256: cbfb0f30292a02a7266fe9804f7f693606b2ead0e1b0168b400c574b064f553a