Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7087279096b72d4…

MALICIOUS

PDF

92.8 KB Created: 2021-03-24 07:31:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f9cf84c0b381acae73ac575ad1cb584 SHA-1: 5b0337c5cf66bfbe572809848cd57df17d8533f8 SHA-256: e7087279096b72d4ff924667d7390fef591b1f69149d12177ca09a4fea910e1d
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal it functions as a link farm, directing users to numerous external PDF files hosted on various domains, likely for phishing or malware distribution. The document's apparent purpose is to deceive users into clicking these links by presenting a seemingly innocuous topic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/award?keyword=3rd+grade+math+review+pdf
    • http://instapriz.website/tenth_maths_guidefgsdg.pdf
    • https://ruzopujiwinor.weebly.com/uploads/1/3/1/4/131452977/nowiwefogeg.pdf
    • https://cdn-cms.f-static.net/uploads/4421462/normal_600b41a505041.pdf
    • https://sajabewegapin.weebly.com/uploads/1/3/4/5/134592402/doguxamopokusolut.pdf
    • http://onlineeshop24.xyz/how_to_write_your_own_exercise_planzv9eg.pdf
    • https://cdn-cms.f-static.net/uploads/4372377/normal_603a5432d3d71.pdf
    • https://kobijetiva.weebly.com/uploads/1/3/4/3/134322382/0ed5e7cd5fd.pdf
    • https://muvepabeburok.weebly.com/uploads/1/3/1/4/131453329/fikewugasujenek-gaked-mufimufi.pdf
    • https://cdn-cms.f-static.net/uploads/4460694/normal_5fd7c42f6baa2.pdf
    • https://kewisivi.weebly.com/uploads/1/3/2/6/132681156/2504028.pdf
    • https://xitorudabetibom.weebly.com/uploads/1/3/1/8/131856365/114067.pdf
    • http://apkweb.net/vaxarazuddd273.pdf
    • https://xaroduzorosu.weebly.com/uploads/1/3/1/3/131398324/soramitetatiteroge.pdf
    • https://zoperugojoboriv.weebly.com/uploads/1/3/1/3/131379643/lunirep.pdf
    • https://moxigowa.weebly.com/uploads/1/3/0/8/130814106/5826032.pdf
    • https://bopevifobomamak.weebly.com/uploads/1/3/0/8/130814579/468592.pdf
    • https://zuzuxaze.weebly.com/uploads/1/3/4/0/134040629/fitilove_wijilova_veririsek_bojotoruti.pdf
    • https://kefuvavubuxega.weebly.com/uploads/1/3/1/1/131164002/0b681ec230e.pdf
    • http://formblckr1.xyz/785593597817hztw.pdf
    • https://murunabijijot.weebly.com/uploads/1/3/5/4/135401069/9981326.pdf
    • http://sadovik.me/dovixutufagorabojatibubrileb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fakomufe.epizy.com/jewel_foolish_games_sheet_music.pdf
    • http://tivurazug.rf.gd/84473864277.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • 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_off000104fc.bin
3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 6440 bytes
font_01_sfnt_off000114f0.bin
8108238c997eb29ec87e6424bf6eb57a20449c4162d184c01c722c0970acae71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114F0 5468 bytes
font_02_sfnt_off00012778.bin
0c406c32261b68e7564453cc60e6d0967fde7fafa925405eef5a6e600b77ebb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12778 12008 bytes
font_03_sfnt_off00015089.bin
52db30b66cfb76898988bc7c6ed152514c301740808ab95bec9c68e49df23550		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15089 16036 bytes

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