Malicious PDF — malware analysis report

Static analysis result for SHA-256 e281712bc4f17e92…

MALICIOUS

PDF

106.7 KB Created: 2021-03-16 20:00:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8ea6fb331d41b8e1b8db6039305ff9b SHA-1: db0c1395a8c756eb710ac5f2c4813de1f493b384 SHA-256: e281712bc4f17e925d26a0dd70644567ebfc06d68334ca2b56827e112d677da0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to suspicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious content, likely a phishing lure disguised as an educational worksheet. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jumiwimov.ru/wix?keyword=the+living+earth+biology+worksheet
    • https://static.s123-cdn-static.com/uploads/4425501/normal_5fc874c3de1ff.pdf
    • https://cdn-cms.f-static.net/uploads/4460263/normal_60501d141c17e.pdf
    • https://finibolamojirum.weebly.com/uploads/1/3/5/3/135341575/pizorasex_jevesagedej_rapexa_gazedaxijefa.pdf
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/5033148.pdf
    • https://bixagitiwor.weebly.com/uploads/1/3/4/6/134618264/mogafa-navokej.pdf
    • http://teenagetutor.net/741571903061n9yx.pdf
    • http://nuveclovet.xyz/kisibedipunoqzfmt.pdf
    • https://static.s123-cdn-static.com/uploads/4368496/normal_5ffa11162ea76.pdf
    • https://mowavowami.weebly.com/uploads/1/3/4/5/134591552/wobapeluxev.pdf
    • http://instapriz.site/bejudil01hrt.pdf
    • https://xuwatezifi.weebly.com/uploads/1/3/5/3/135305435/watopigumevepusaxal.pdf
    • http://instapriz.online/christian_counseling_ethics_sanderskrdix.pdf
    • http://sexesex.site/58618960899b2jsz.pdf
    • https://bijuxoku.weebly.com/uploads/1/3/4/9/134901677/7195259.pdf
    • http://form-lnstagramverificationbadge.com/how_to_get_a_land_contract_in_michiganykpyp.pdf
    • https://sugelama.weebly.com/uploads/1/3/4/8/134898925/xamezujuzetok.pdf
    • http://praktika-ingenieur.com/rixojipepirekotind90u7.pdf
    • https://cdn-cms.f-static.net/uploads/4366402/normal_602204a0313f7.pdf
    • https://bunavomotuta.weebly.com/uploads/1/3/4/6/134606544/4327f04ff9f9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_1da8029c9ae84d929f94fa3ecdd3a28d.pdf?index=true
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_52a1d0ac46574a83bc73e50ad6721709.pdf?index=true
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_344f1f5aa0ce4bd986d4275eb9219c02.pdf?index=true
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_f78ffdc75d8044288f3232ac22f3d9df.pdf?index=true
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_23334247762d4c74b4c95211d07cc130.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015fc1.bin
e7b7567c1c2a7b3ce0c1e9884f35f8223343922956b7c878bf491735ee98b2cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15FC1 5352 bytes
font_01_sfnt_off00017211.bin
885ab075d84ee0e6f392f74332de20d3d1a14d95bf1a1d91f6d00490fbe8e00d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17211 13520 bytes

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