Malicious PDF — malware analysis report

Static analysis result for SHA-256 643bd3c793889bba…

MALICIOUS

PDF

76.7 KB Created: 2021-02-02 14:04:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 81601d83bf3a9686f378d49fca1e7d59 SHA-1: 29a7b8d53643b9da77dbbc7b0494baa58acc43e4 SHA-256: 643bd3c793889bba8cb14350489b7fc3b5f0d7d2a7a473a16e5c62521eeea651
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/aws?utm_term=reportagem+sobre+consumo+consciente+da+agua PDF link annotation
    • https://rajexomogalifi.weebly.com/uploads/1/3/4/8/134891851/mamegageni-kiwisinet.pdfIn PDF document text
    • https://muxasikij.weebly.com/uploads/1/3/1/8/131872285/rafemaleg.pdfIn PDF document text
    • https://funosojo.weebly.com/uploads/1/3/5/3/135336125/wenolinilatetox.pdfIn PDF document text
    • https://cdn.sqhk.co/gugapedulob/iyBrjjT/yo_yo_ho_ho_retro_platformer.pdfIn PDF document text
    • https://cdn.sqhk.co/midusuworab/JtaOHji/page_plus_cellular_verizon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383923/normal_5fec7415e24c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408482/normal_60069bbf46581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383797/normal_60174ed9b4093.pdfIn PDF document text
    • https://cdn.sqhk.co/bulegumu/Pyhnjho/masevawipefig.pdfIn PDF document text
    • https://cdn.sqhk.co/feledigowud/gzhjkih/pigtronix_infinity_2_looper_pedal.pdfIn PDF document text
    • http://rigizaba.iblogger.org/5_star_chocolate_information.pdfIn PDF document text
    • https://cdn.sqhk.co/wolebiduju/giYjcO4/ritafulinesifer.pdfIn PDF document text
    • https://judozolu.weebly.com/uploads/1/3/1/4/131407514/tadozakuwumu.pdfIn PDF document text
    • https://cdn.sqhk.co/lilavokolet/jeit4jb/bujizemexusuve.pdfIn PDF document text
    • https://neriborotarisim.weebly.com/uploads/1/3/4/3/134345051/2869878.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://webidiwotew.epizy.com/vakorazigomeno.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/easy_printable_english_worksheet_for_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/instagram_live_er_chrome.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/62230448037.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE973 5508 bytes
SHA-256: e5baa13017f67f33e5235eda41ccc7b7c4b06b2e498907e34d863c26bda7b1a1
font_01_sfnt_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 13088 bytes
SHA-256: f1f902b9c2f453aa3539faf9326f095ee802de6b6d1c6ff7ccb5c972a3201a98

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