Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf2db365876a5ea…

MALICIOUS

PDF

75.5 KB Created: 2021-04-04 23:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd234f13f8dd51a41c55374719fbefad SHA-1: 861de3a6eab2646a8d843d659462e394fc148377 SHA-256: 3bf2db365876a5eafbb80c1510215ff157dae3c2bf2378ee3d7a9a778603a084
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 payload. It contains a mass of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or redirection scheme. The primary lure appears to be a search result for "What is definition of community work", designed to draw users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://kuzutuzo.ru/strik?utm_term=what+is+definition+of+community+work
    • https://govuvafokixer.weebly.com/uploads/1/3/1/6/131607022/tebukujikoravowifike.pdf
    • https://jinajifija.weebly.com/uploads/1/3/4/8/134889339/jukil.pdf
    • https://zetaxufonepijak.weebly.com/uploads/1/3/4/3/134353616/vituzijifedesanapajo.pdf
    • https://mozokidadivu.weebly.com/uploads/1/3/1/1/131164210/gelobugidafijuz.pdf
    • http://gemixemufasu.22web.org/cisco_catalyst_ws-c2950g-24-ei.pdf
    • https://fuzaterolipi.weebly.com/uploads/1/3/1/4/131438829/lokoxux.pdf
    • http://xujilutobidiko.iblogger.org/123904308.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b73b9701-b1df-43be-b031-73419f87697c.filesusr.com/ugd/bfbd96_4b716acbfa0c4d5497d96a6d6daf4622.pdf?index=true
    • http://zilajib.epizy.com/40983215920.pdf
    • https://uploads.strikinglycdn.com/files/68a086ab-0c02-4ea3-9e70-9c8148f51069/22116880436.pdf
    • https://uploads.strikinglycdn.com/files/562c236f-40e4-4584-9e6c-4c1aef0bbbbe/mozefukefetofuwuwa.pdf
    • http://depuxodime.epizy.com/character_design_for_animation.pdf
    • http://wikeziduloduw.rf.gd/cengage_calculus_free.pdf
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_8ca44657fbcb42cfb5c229e5a2003580.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ac2162fb-d2c1-4f26-b124-57efa94e1507/mokujovin.pdf
    • https://uploads.strikinglycdn.com/files/3517273d-bdd5-4f46-98f5-9d55d8911c7f/jojaxonisuwotidevupoxazo.pdf
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_c8cab2836a184d2c8bf8215f26a70d23.pdf?index=true
    • https://uploads.strikinglycdn.com/files/398bfe5f-c6de-48cc-b40f-6c62f01edabf/wisefatisixemeken.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e908.bin
c70bc7bc48f5e530c95b0bcf5d2093c161b49a86ffdbb90656cf05686726f048		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE908 5500 bytes
font_01_sfnt_off0000fbb0.bin
2617d02f332e2966dc7dbd47b2560818b2eae495f4959be02b13c25d9a62b21f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB0 10868 bytes

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