Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7db358d60b892a1…

MALICIOUS

PDF

82.8 KB Created: 2021-03-24 00:04:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 254434bb6c28aca0c1765cfda82de775 SHA-1: 4b271d725ea39d2905a67bc1bbaa04e774e6a07f SHA-256: f7db358d60b892a1b5aaf5a16b55bb9f0f27b0f324a2e20f41e1bc8352f64155
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a large number of embedded external links, suggesting a link farm or phishing attempt. The document body is heavily obfuscated and appears to contain metadata related to wkhtmltopdf, but no clear user-facing text. The presence of numerous external URLs points towards an attempt to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/wix?keyword=the+bugs+bunny+and+tweety+show+season+1+episode+1
    • https://static.s123-cdn-static.com/uploads/4479906/normal_5ff0e9152563e.pdf
    • https://cdn-cms.f-static.net/uploads/4466996/normal_603bee9deed1c.pdf
    • https://sadavofabuloxus.weebly.com/uploads/1/3/5/3/135316226/7776411.pdf
    • https://cdn-cms.f-static.net/uploads/4408464/normal_6019c6e608a42.pdf
    • https://mesopivupezuna.weebly.com/uploads/1/3/5/3/135311967/zexivuj.pdf
    • https://gawobomune.weebly.com/uploads/1/3/5/3/135317514/tovirodikewugifavu.pdf
    • https://cdn.sqhk.co/rijomawonuj/c4ggjfD/crusader_kings_iii_battles.pdf
    • https://bidopafogusiw.weebly.com/uploads/1/3/1/0/131070115/cd0e419bb1a.pdf
    • https://cdn.sqhk.co/xipepovivik/gjhgjc6/class_7th_science_ncert_solution_chapter_1.pdf
    • https://cdn.sqhk.co/bikakigiben/jjQhg5n/story_mode_gta_5_money_glitch_offline.pdf
    • https://jutijodofolumel.weebly.com/uploads/1/3/4/0/134012985/tibuselon_solopativo_fidowijininuf_makum.pdf
    • https://liramuxusere.weebly.com/uploads/1/3/4/5/134577046/pubepuvaduwat_gomogigegaba_lewisulonexig_zilofuza.pdf
    • https://cdn.sqhk.co/tujarazimok/lpibigd/kanenegaz.pdf
    • https://cdn-cms.f-static.net/uploads/4472764/normal_60486bde17c0c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_ad2bb81926db4573916d3677bc72a303.pdf?index=true
    • https://94cb5446-44f7-499c-8ddd-8d9df3a2db3d.filesusr.com/ugd/9b9c26_2fe57f5db12a4dcf8c776afa1590cdb1.pdf?index=true
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_803cb638096e48e19797b4e2943a3c84.pdf?index=true
    • https://a179b4bb-f9e1-4b0b-8685-f881d2afde68.filesusr.com/ugd/0fdb6d_78298b8558d0445290e287fb6fd46e0b.pdf?index=true
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_0f77f7e31cb0478fb35d3816e922afa4.pdf?index=true
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_a90d7a2877d3445a8848a57ae1283d67.pdf?index=true
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_2b9ed7d619644531b8126e3828c7ad0e.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f80f.bin
bc269ef7e074ed1efbf16f15f6b8fc805b9462e3e018c3d700cd1df667db4240		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF80F 5308 bytes
font_01_sfnt_off00010a30.bin
0631195edb6dc18f05ae8cd8cc83a07e13ddcc384e89bbcc6807f55baf1b1ff3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 10892 bytes
font_02_sfnt_off00012f61.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F61 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.