Malicious PDF — malware analysis report

Static analysis result for SHA-256 870513d8581186a5…

MALICIOUS

PDF

77.9 KB Created: 2021-04-22 12:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b9aca823497bd61f3b029814369bf7e SHA-1: 7b2087a73a0553f259e1642176b5fb47125ca686 SHA-256: 870513d8581186a5decab3f3602524a89e4b0979854954a864361c52529d7a87
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains text related to a 'co teacher job description', likely serving as a lure to encourage users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=co+teacher+job+description
    • https://sojekaga.weebly.com/uploads/1/3/1/0/131070529/ec4596259607606.pdf
    • https://fuwefepitebu.weebly.com/uploads/1/3/4/7/134709748/kurarofinuwa-bukiwulolo-disekifanewalub-gadidoboko.pdf
    • https://vetebifarex.weebly.com/uploads/1/3/4/0/134016991/958522.pdf
    • https://nevidabaxava.weebly.com/uploads/1/3/0/7/130775666/3195783.pdf
    • http://zedukibawubige.22web.org/jipumijofevoloxiwute.pdf
    • https://limezisetuf.weebly.com/uploads/1/3/4/8/134871661/zarukovegelap-xenuburepazem.pdf
    • https://pekavodasusoku.weebly.com/uploads/1/3/5/9/135982803/kexotidek_dojitemaxar_xomivigudumez_xesuradujakur.pdf
    • https://vajugape.weebly.com/uploads/1/3/4/7/134767319/lafemamep-netoxewizurogib-visisuve.pdf
    • https://sapuzexa.weebly.com/uploads/1/3/5/3/135348006/34e69f44e.pdf
    • http://mapumuvovabukux.22web.org/fulalidivi.pdf
    • https://minoximamus.weebly.com/uploads/1/3/1/4/131437876/8238b188b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zebafuvevejol.epizy.com/dufuzanodewalibageti.pdf
    • https://uploads.strikinglycdn.com/files/e4db1544-c1c1-4826-b216-e4ee0a71849a/why_is_harry_potter_not_on_amazon_prime.pdf
    • http://mejesikiwabez.epizy.com/25019025593.pdf
    • http://laninigetiwaw.rf.gd/38660718084.pdf
    • http://zonezegowo.rf.gd/temperament_and_character_inventory_questionnaire.pdf
    • https://uploads.strikinglycdn.com/files/86cb7b9a-8505-48b8-b2f5-81b4164d8241/11629320102.pdf
    • http://vebilotavofako.rf.gd/56229332238.pdf
    • https://uploads.strikinglycdn.com/files/6f4f7a5d-9f10-47f1-aecf-d78926225bf0/tu_mundo_empanadas_allentown_pa.pdf
    • http://weralawubuzeg.epizy.com/eagle_scout_congratulations_card_template.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea12.bin
30505cf77ba8a3f6a71ba56c2bc124282218affb14726b01dc63d1ce4df229fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA12 2856 bytes
font_01_sfnt_off0000f43b.bin
60ec12ce41b0919eeadd0688ab56b4fd0bb4e53c464669d0e0aaa64be95d2906
pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 5252 bytes
font_02_sfnt_off00010601.bin
72f554525b49e179f9d561c4864c1fddc95ad5b19388bba8b613ab185ebc8644
pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 10488 bytes