Malicious PDF — malware analysis report

Static analysis result for SHA-256 d183d2832271f3bf…

MALICIOUS

PDF

89.2 KB Created: 2021-03-19 23:02:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80c56a669364e90a44f6cd67d2f2838d SHA-1: eb29043f708a14d588a9ca4ad48edcdfc8efff31 SHA-256: d183d2832271f3bf1967dc7debd7457d560cb850254fad628b22d6c6bdb0abf1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF files on various domains. This suggests a link farm intended to drive traffic to potentially malicious or phishing websites. The ClamAV detection and ML classifier further support the malicious nature of the file, indicating it is likely a phishing or malware distribution tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/award?keyword=alkyd+resin+manufacturing+process+pdf
    • http://totalcreditreport.info/85984254591t0smm.pdf
    • http://rujibobisurixu.iblogger.org/online_recruitment_system_project_report_free_download.pdf
    • http://fasad-dom.site/what_is_the_original_text_of_the_bible426qk.pdf
    • http://nodalaxav.22web.org/47241165932.pdf
    • http://setlyb.online/mata_rani_ke_bhajan_pagalworldgaf2j.pdf
    • http://optamorem.com/zewoxekupoja8k9.pdf
    • http://tilikef.mygamesonline.org/lazabij.pdf
    • http://bunnygummy.ru/96388192962z1bdr.pdf
    • http://zozavelomidabi.scienceontheweb.net/5037926214.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://futakanawus.onlinewebshop.net/78845147047.pdf
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_efb7104d6c2849a7880d74830b78f058.pdf?index=true
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_3f337f811eb14dedaee031d4e62c4c06.pdf?index=true
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_b220c1b6f4174568bf097a5519afd14d.pdf?index=true
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_579b9d03fc094ae3b98e769721458b36.pdf?index=true
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_bd7baaa84eb74c94b5cdcd38257f0a81.pdf?index=true
    • http://gaditerigasut.rf.gd/best_ad_blocker_for_android_apps.pdf
    • https://2dc0326d-ac60-47d8-bf46-f2dc9d334570.filesusr.com/ugd/21b4a7_cdb93246c3c64f96a33375c5063cf772.pdf?index=true
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_ed93073e54ca463bbe26f13f8b5aa4b5.pdf?index=true
    • http://vukefuxi.epizy.com/optex_vxi_manual.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111d7.bin
161eab2fe0541b2d22e1e22ca138fa369caa9b1516ef0a6fb93ccff5adb551c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111D7 5512 bytes
font_01_sfnt_off00012481.bin
6cb8f7891a9453bf50e9db5f9e2f61f45c5821aa3f8cdc26f88a3a3b26f568e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12481 10732 bytes
font_02_sfnt_off00014952.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14952 4324 bytes

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