Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3b61047538f037…

MALICIOUS

PDF

72.7 KB Created: 2021-03-28 12:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 369ee5b2640d0a98a099bf0ff405d4df SHA-1: d477aa4ea5c019548ab621d636a55358f06b1324 SHA-256: 4a3b61047538f037d6fec972cd16d83db2c037490c72913de66082c950797d7c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to educational content, likely to trick users into visiting the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=classification+of+animals+worksheet+grade+3 PDF link annotation
    • http://lumogodasekepi.mypressonline.com/95_theses_short_definition.pdfIn PDF document text
    • http://ludshop.xyz/pugurikawalosekanukedorotz2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481520/normal_603bf73e5f007.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482023/normal_60089fb7a46fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415292/normal_5fca2bf0dd4c6.pdfIn PDF document text
    • http://xelibirujegid.mywebcommunity.org/gusanuvovitolexoturuxapod.pdfIn PDF document text
    • http://forkidsshop.online/metta_world_peace_wife_jennifer_palmaneiiq.pdfIn PDF document text
    • http://flowerport.shop/21946534184fl1y4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445103/normal_602548a3926c8.pdfIn PDF document text
    • http://viwavidif.getenjoyment.net/milora.pdfIn PDF document text
    • http://bred-enligne.com/sadimaro0931g.pdfIn PDF document text
    • http://wasegulom.mygamesonline.org/xukope.pdfIn PDF document text
    • http://jidudilubad.mygamesonline.org/bhaktamar_stotra_lyrics_in_tamil.pdfIn PDF document text
    • http://ionatr.space/list_of_adjectives_to_describe_a_perhqkzq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374700/normal_5ff719f095feb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_043ef48a7e7a4ed3985460c1d67cfe28.pdf?index=trueIn PDF document text
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_c43cfe9b5d604dabaebc131e9111d33a.pdf?index=trueIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_c49dfdaaeba44211afc89ca013d73424.pdf?index=trueIn PDF document text
    • http://fumibilulad.atwebpages.com/carbohydrates_biology.pdfIn PDF document text
    • http://vibirokudod.myartsonline.com/a_decima_profecia_celestina.pdfIn PDF document text
    • https://f856bbc4-01c8-45e4-8891-a53c5ee59fd0.filesusr.com/ugd/8e827e_8d87de25efb74b3f9ac938077224b883.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD257 5564 bytes
SHA-256: 16c0bc7622ccb41d83dacc21decd44a10bb5fc093bf9d77d98fad43bf3cb418d
font_01_sfnt_off0000e52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52C 10004 bytes
SHA-256: 1cda2feff0bbce85bfc5c6dc5a0c25cff97916c3cf26f692e899ee1a18e11b91
font_02_sfnt_off00010767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10767 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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