Malicious PDF — malware analysis report

Static analysis result for SHA-256 49dfc7a6d7ff8af2…

MALICIOUS

PDF

74.6 KB Created: 2021-05-12 10:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 889e5f5c79d4f4beff36f2f173a65adb SHA-1: 95790626f886f2a81116902492c52a7a17e32641 SHA-256: 49dfc7a6d7ff8af2bb9989ac9982430c874fa1fef107aff730e53776af97843d
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 PDF files hosted on file-sharing services, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=tone+of+voice+poetry+definition
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/6052741.pdf
    • https://saselafe.weebly.com/uploads/1/3/4/8/134894966/kafokozejawexek.pdf
    • https://lakalenavis.weebly.com/uploads/1/3/4/3/134313358/wosalolemerifi.pdf
    • http://kadabafomelu.66ghz.com/yaari_avneet_kaur_song_pagalworld.pdf
    • http://skidki-day.shop/insinkerator_master_plumber_badger_5_1_2_hp_waste_disposer1v7cw.pdf
    • http://circus.market/application_of_nanotechnology_in_drug_delivery0atkx.pdf
    • http://duzegipim.22web.org/zikivoxijidevarikemup.pdf
    • https://monezoxikaxusoj.weebly.com/uploads/1/3/1/4/131453753/9706809.pdf
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/gufufu-duvejutu.pdf
    • https://xemibunadagom.weebly.com/uploads/1/3/4/6/134639404/zezariwijejexaderaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1dfef493-bba3-4db0-89f7-7cef958ceea2.filesusr.com/ugd/3dbeb3_6aece4a9f091404da5e54b0f5df03991.pdf?index=true
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_3cc713c902604e4b892199b8fcb89a73.pdf?index=true
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_78527e92f8b24c088625ab6706c6a69e.pdf?index=true
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_5237e0f06fa445c591fc09b830f17f23.pdf?index=true
    • https://f72e0e13-a873-49c5-9cb5-3c2848b8c5b2.filesusr.com/ugd/f8ba4b_5eca14b6498e4d45aae3cdad309835b9.pdf?index=true
    • https://de2a8dfc-dc8d-4d62-be3b-f97abdd17bf6.filesusr.com/ugd/c722c2_4231990eb7454120a870197ba78d54c2.pdf?index=true
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_769c1f96a84045249abdd0a11d783685.pdf?index=true
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_2a1a9ab5098a41af9b94283e29b45242.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_off0000e573.bin
7123eae87a1aac0b8c49ed421fc7c3dcf0aaf87e252a50cc59fe4b7449780a1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE573 4840 bytes
font_01_sfnt_off0000f613.bin
42136717f0d317068cdea5d0096c095e3e1a9772a3c590a8e90a1a8ff87043bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 11068 bytes

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