Malicious PDF — malware analysis report

Static analysis result for SHA-256 819b836eab893678…

MALICIOUS

PDF

81.4 KB Created: 2021-04-08 06:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a9553c68631431d94db9c47eff3c9ec7 SHA-1: 56a7d19ca8b0ce844e66917c4dc8ff3b09dd1e46 SHA-256: 819b836eab8936785eeffdbed68bd193b3ff2362f3480cc041ae978c31cf7ff9
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 0.9993

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://maypoin.ru/wix?keyword=chapter+7+section+2+elections+core+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449616/normal_6033fa5106f60.pdfIn PDF document text
    • https://xofilovinavi.weebly.com/uploads/1/3/1/3/131379248/nonobuwodis.pdfIn PDF document text
    • https://vitasexabu.weebly.com/uploads/1/3/0/8/130813400/1939037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487197/normal_602786d7c9070.pdfIn PDF document text
    • http://pajopoxofof.iblogger.org/kofagapujatumobajus.pdfIn PDF document text
    • https://kikuwigew.weebly.com/uploads/1/3/1/4/131407235/nizumisubejari.pdfIn PDF document text
    • http://novijixonusasu.mywebcommunity.org/68377933956.pdfIn PDF document text
    • https://topagolidokade.weebly.com/uploads/1/3/4/5/134502990/disijagimijow.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/how_to_charge_black_and_decker_drill_battery.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484356/normal_6012b779b56d8.pdfIn PDF document text
    • http://mosomupusafebin.medianewsonline.com/the_addictive_personality.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_6ea47830be064ef3847954677f686803.pdf?index=trueIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_71dbf1997a874f28ac2984dbc16b292c.pdf?index=trueIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_b768bfa4216645b88df4fb45f4a835f9.pdf?index=trueIn PDF document text
    • http://jeneviwa.epizy.com/aurlie_laflamme_tome_8.pdfIn PDF document text
    • https://8c17aa34-c454-4d6c-a218-8929c845e329.filesusr.com/ugd/808cd0_6a21e72b614f438da9178a753b6bd663.pdf?index=trueIn PDF document text
    • http://fugawulewevutas.rf.gd/noguwug.pdfIn PDF document text
    • http://rafodize.rf.gd/95209756938.pdfIn PDF document text
    • http://jumepenitujox.atwebpages.com/periodic_trends_worksheet_1_using_the_periodic_law_answers.pdfIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_47ef445b13b84ffc98fcaa683ee6c18a.pdf?index=trueIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_9e9c13b061c04081b11e9d9d65c8df38.pdf?index=trueIn PDF document text
    • http://rigamijuzekup.rf.gd/pawavizinupodenewabala.pdfIn PDF document text
    • http://jemukiguwuw.myartsonline.com/37827394648.pdfIn PDF document text
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_ed7e6a5f666e40949ea2f3216ba5399e.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10084 5296 bytes
SHA-256: a9e09eb0122359818ee7a4c4311e86a62177b282e577489bf96e28bb23b1a6a8
font_01_sfnt_off00011298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11298 11072 bytes
SHA-256: 9c17e3a8ce9979d8c79d0a1a46aa902491483be4c04defa7729488a783f93ddb