Malicious PDF — malware analysis report

Static analysis result for SHA-256 efabfe79ebcf4fa8…

MALICIOUS

PDF

75.4 KB Created: 2021-03-26 07:46:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7123069ad8de6527547b83dba6715895 SHA-1: 743d7d39aed95df8888e3aa6e3827fcf55181651 SHA-256: efabfe79ebcf4fa821db12606efa5b285e9e83c9ff6d3a7517543751bc4a193c
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including a link farm and an invisible link to a suspicious domain, suggesting it's designed to redirect users to malicious websites. The presence of PDF_SEO_LINK_FARM and PDF_SUSPICIOUS_LINK_LURE heuristics further supports this, pointing towards phishing or malware distribution as the primary attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://mezovuduw.ru/wix?keyword=windows+loader+unsupported+partition+table+como+resolver
    • http://subumobo.22web.org/47174219847.pdf
    • https://static.s123-cdn-static.com/uploads/4375194/normal_5feb0a53ef8ab.pdf
    • https://cdn-cms.f-static.net/uploads/4369916/normal_6054257bdce12.pdf
    • http://form-copyrightservices.com/does_lazy_boy_recliners_have_a_lifetime_warrantylzm8b.pdf
    • https://static.s123-cdn-static.com/uploads/4407316/normal_5fed65b2a1027.pdf
    • https://static.s123-cdn-static.com/uploads/4384633/normal_5fdf07d590b62.pdf
    • http://divasamuzive.iblogger.org/42480884632.pdf
    • http://ig-supportcenter.xyz/wiwelipodeti1nn5t.pdf
    • https://cdn-cms.f-static.net/uploads/4381980/normal_60298eba802c1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_0c5e406b666d42f49161e3b41e01aa99.pdf?index=true
    • https://s3.amazonaws.com/fonazuzixagizir/59916479510.pdf
    • https://s3.amazonaws.com/jusuberu/what_child_is_this_vocal_duet_sheet_music.pdf
    • https://s3.amazonaws.com/gezejoputiwinu/28709135950.pdf
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_4257b291ec774817a47ebda015176d0b.pdf?index=true
    • https://s3.amazonaws.com/feseni/73674347959.pdf
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_16e2a2628b2e487dba01a81e57eed24b.pdf?index=true
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_a8d4191cc01743898c77fbe2c4f31b65.pdf?index=true
    • https://s3.amazonaws.com/gezetega/wu_tang_an_american_saga_episode_4_song.pdf
    • https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_60fe129cbbc540bb8e6ddded5e5af91a.pdf?index=true
    • https://0a37a3d5-a0bf-4e77-8ff5-6127fd08aefa.filesusr.com/ugd/6046c9_d7b14154305a4e6d882d7f9c6891c27c.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca9c.bin
5f154b1303fc234cecb648714a6723a3a26d5f891cd7acf80295744681f66a72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA9C 5524 bytes
font_01_sfnt_off0000dd5c.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 1800 bytes
font_02_sfnt_off0000e5ea.bin
ed81aaf825725d057b2f94e880f6634c1434d2b163fc58c909dde4b4dabef4b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EA 10500 bytes
font_03_sfnt_off00010924.bin
de4d8b2f57bd79f1a868fabda613d9936b110e31710edd4728466090b424b6ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10924 16340 bytes

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