Malicious PDF — malware analysis report

Static analysis result for SHA-256 c664d91a401741f0…

MALICIOUS

PDF

89.1 KB Created: 2021-05-23 22:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 678b707cadecd1ba069eff70453ce5e4 SHA-1: ade451e915219f09fc79179953f9475d5fc727da SHA-256: c664d91a401741f0239cd96da3b7ecb680be1c95d6001d6c1ba33a4cd38c637e
156 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. The document contains numerous external links, suggesting it's part of a link farm designed to redirect users to potentially harmful websites, as evidenced by the PDF_SEO_LINK_FARM heuristic. The embedded URLs, such as 'https://jumiwimov.ru/strik?utm_term=how+to+calculate+awg', are likely used to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/strik?utm_term=how+to+calculate+awg
    • https://tazokadenu.weebly.com/uploads/1/3/2/6/132695553/wakiminobopir.pdf
    • https://static.s123-cdn-static.com/uploads/4482625/normal_5fec989bdb292.pdf
    • https://dizuvojuxi.weebly.com/uploads/1/3/1/1/131163617/riwanofozefidi.pdf
    • https://gigiwejube.weebly.com/uploads/1/3/5/9/135984489/degaxowebedebudo.pdf
    • https://cdn-cms.f-static.net/uploads/4406455/normal_602b985967fd8.pdf
    • https://cdn-cms.f-static.net/uploads/4369656/normal_6022f0d890fa3.pdf
    • https://cdn-cms.f-static.net/uploads/4444877/normal_605b1c1fb60c1.pdf
    • https://kazowajobizitat.weebly.com/uploads/1/3/0/7/130775795/7614691.pdf
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/nutubaguwox.pdf
    • https://sovitinalul.weebly.com/uploads/1/3/4/8/134882068/00eb1558402a165.pdf
    • https://sanepawoja.weebly.com/uploads/1/3/4/5/134579143/xejavunojofi.pdf
    • https://cdn-cms.f-static.net/uploads/4463807/normal_603dc2e1c1c50.pdf
    • https://duzetokip.weebly.com/uploads/1/3/4/4/134404829/felilulibaxuz.pdf
    • https://static.s123-cdn-static.com/uploads/4414339/normal_60040ba790f7e.pdf
    • https://defuboxuzunusam.weebly.com/uploads/1/3/3/9/133986960/8940569.pdf
    • https://cdn-cms.f-static.net/uploads/4391317/normal_602a39436af0f.pdf
    • https://sefelitajirowa.weebly.com/uploads/1/3/0/9/130969992/rononivuzetu_nowubitu_nabawutereviz_gukifijal.pdf
    • https://static.s123-cdn-static.com/uploads/4419225/normal_5ff021672a44f.pdf
    • https://gepagalegizexu.weebly.com/uploads/1/3/4/4/134478943/486595.pdf
    • https://ninefajesazaga.weebly.com/uploads/1/3/5/3/135384029/638d6c1.pdf
    • https://static.s123-cdn-static.com/uploads/4403688/normal_60086fdb7033b.pdf
    • https://tedawubav.weebly.com/uploads/1/3/4/3/134376018/9553253.pdf
    • https://cdn-cms.f-static.net/uploads/4461746/normal_60177c4f8ce22.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010741.bin
038e6d47057d10385bfd9b85902ea05ff925ba5c88163901531c1092eb846337		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10741 4744 bytes
font_01_sfnt_off0001178d.bin
e501c7eb0b2616fd2676db46a0fbf5f9451484256e5f685802dab9be7498342e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1178D 12464 bytes
font_02_sfnt_off00014270.bin
354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14270 16036 bytes

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