Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be8b2ec331afe73…

MALICIOUS

PDF

76.3 KB Created: 2021-03-15 14:42:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be6d1bd2ed5127b91e126dbb3c135713 SHA-1: 501c2b7e9c34ccf6c45ba20b8dc6ff6da3a6ba30 SHA-256: 7be8b2ec331afe737c1e45ccc9baa379a61986832b9d7abc1984c5ee7a19ca04
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to link farms designed to distribute malware or facilitate phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classifying it as a phishing trojan. The heuristic 'PDF_SEO_LINK_FARM' highlights the creation of a large number of external links, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xajibur.ru/award?keyword=benigna+definicion+pdf
    • http://saniwofixapu.mygamesonline.org/38030951254.pdf
    • https://zewalomoweso.weebly.com/uploads/1/3/4/5/134588134/ropotujol_siloraxodeju_xarazumus.pdf
    • https://moxuvobojivoz.weebly.com/uploads/1/3/0/8/130873852/5199174.pdf
    • http://midarujiwuvi.mygamesonline.org/71799152724.pdf
    • https://tibilizam.weebly.com/uploads/1/3/0/7/130775373/bewisetefej.pdf
    • https://labupapem.weebly.com/uploads/1/3/1/4/131406977/88462466a38.pdf
    • https://dowibowaxetejoz.weebly.com/uploads/1/3/0/7/130740522/9201310.pdf
    • http://xedijama.getenjoyment.net/20412174752.pdf
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/gosizubinibez.pdf
    • https://rixagaxovexi.weebly.com/uploads/1/3/4/0/134000332/kedakarimi.pdf
    • http://gasolotiravizid.sportsontheweb.net/38717979672.pdf
    • https://jetorijeroxu.weebly.com/uploads/1/3/4/6/134693882/6f9b268ed6ae630.pdf
    • http://worameruvejaka.mywebcommunity.org/vefeporafifefu.pdf
    • https://pinosapop.weebly.com/uploads/1/3/4/1/134131344/jiwelar_wupofibowurafo_bazex_kiworewujo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_da7224228ef5468d8be0c09fa41dbc81.pdf?index=true
    • https://uploads.strikinglycdn.com/files/84a08df4-a06a-4132-91ec-07e936704944/rizejofopotamuxomegu.pdf
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_6bb11bcd65fc457e801f3d0622a42c16.pdf?index=true
    • http://xifimerin.onlinewebshop.net/lijiko.pdf
    • http://bitenozof.atwebpages.com/abnormalities_of_umbilical_cord.pdf
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_d29523b6e90844cdbf17a674ac2a08e9.pdf?index=true
    • https://uploads.strikinglycdn.com/files/40874073-50be-4b0d-a59f-837c40d291b8/after_we_collided_cast_members.pdf
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_3e78bd1ec56c47fc8b8b7ff6952f5cec.pdf?index=true
    • https://c3d762b3-5d50-4891-ab6d-43710edd2423.filesusr.com/ugd/3254bf_aca0d417290c4aed80fa4892f4671b3c.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8c8.bin
88c990b8434b1617a0139b863ea26357fb938d4bca36710c7de610bd56051dd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C8 5068 bytes
font_01_sfnt_off0000fa2a.bin
02e2972ac9a74dcb145606bed88405dc5802e8243090bd98e77313293b0925bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 12440 bytes

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