Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb90a284eb24936b…

MALICIOUS

PDF

79.5 KB Created: 2021-04-17 21:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5d1a4f0f067f111a1fa39fb9c2dfa43 SHA-1: 2b6dea4ada23004c655953e7b6d41485c1ddc582 SHA-256: fb90a284eb24936bea6e5710944255b29e307c077b55afef76ff08f737cf205e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a large number of external links, suggesting a link farm or redirection mechanism to malicious sites. The embedded URLs and the document's apparent purpose of providing 'exercises' are likely pretexts to drive traffic to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/strik?utm_term=present+simple+exercises+with+answers+pdf
    • http://gagimubu.mywebcommunity.org/46197207762.pdf
    • https://cdn-cms.f-static.net/uploads/4457302/normal_60291e3fc024e.pdf
    • https://cdn-cms.f-static.net/uploads/4375194/normal_6050d35984afc.pdf
    • https://static.s123-cdn-static.com/uploads/4495974/normal_5febec25bd651.pdf
    • https://cdn-cms.f-static.net/uploads/4406191/normal_60555db4042db.pdf
    • http://suporefebakibur.mygamesonline.org/blackjack_cheat_sheet.pdf
    • http://lakujalinifibo.mypressonline.com/public_relations_ebook.pdf
    • http://xufadaxedi.22web.org/complete_ascii_code_table.pdf
    • http://fusagawi.iblogger.org/17135997401.pdf
    • http://gipogup.sportsontheweb.net/39400054051.pdf
    • http://nosixavol.sportsontheweb.net/accelerated_learning_techniques_brian_tracy_free.pdf
    • https://cdn-cms.f-static.net/uploads/4445116/normal_601417db6f519.pdf
    • https://cdn-cms.f-static.net/uploads/4459481/normal_6009f5bd72272.pdf
    • http://dororuminaxa.mywebcommunity.org/continuity_equation_in_cylindrical_coordinates.pdf
    • https://cdn-cms.f-static.net/uploads/4419425/normal_6055f34f65fb8.pdf
    • https://static.s123-cdn-static.com/uploads/4365608/normal_5fde44108829c.pdf
    • https://cdn-cms.f-static.net/uploads/4368760/normal_602e306b08698.pdf
    • http://fumexijana.getenjoyment.net/19320891966.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lezefivupeke.epizy.com/49569584234.pdf
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_6310d9d8fe6a4a30b5a6527d27289191.pdf?index=true
    • http://roxujewov.myartsonline.com/waxedujugolokov.pdf
    • https://7ed1f289-57d1-4e2a-9ee4-b64e0eb498cf.filesusr.com/ugd/13dc0c_944132e49945476f9d8cf59524d129ef.pdf?index=true
    • http://bizosubage.rf.gd/femebafobojuloliposu.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_off0000eb1e.bin
29c8e2babd025172d5c9baad20c0b8d1158b5879d4b80c41d72cc08cdca9643a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1E 5232 bytes
font_01_sfnt_off0000fcbe.bin
8fda87bf4522209b8c53f3742c1913c7304071ee74000a37f4b79d56c67099ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBE 10952 bytes
font_02_sfnt_off000121fb.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121FB 4324 bytes

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