Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d414d73bc9f781d…

MALICIOUS

PDF

83.8 KB Created: 2020-11-25 18:40:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04d70ba6b767a85be0acc2f213efa9f8 SHA-1: 1c52a4d090108cf75798c03a9c6c475c841b11b3 SHA-256: 4d414d73bc9f781d808ff7fad3a136d131667c0779d85ac5db1312530307d07c
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Weebly domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. ClamAV also detected the file as Pdf.Phishing.Trojan. The presence of embedded URLs and the nature of the heuristics strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://gettraff.ru/strik?utm_term=reflexive+verb+conjugation+italian
    • https://latafixewikokaj.weebly.com/uploads/1/3/4/6/134687196/tugido.pdf
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/pofejamudugobev_tekuruto.pdf
    • https://jakilirimilibev.weebly.com/uploads/1/3/4/8/134862861/gipebiredimikemame.pdf
    • https://sikisesuleze.weebly.com/uploads/1/3/4/4/134445421/9140029.pdf
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/bb83642d4537.pdf
    • https://lidikizibapusak.weebly.com/uploads/1/3/4/8/134883913/4375317.pdf
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/7463368.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wukara/11159908470.pdf
    • https://uploads.strikinglycdn.com/files/cd299566-3b70-4819-a665-157501704357/d_d_heroes.pdf
    • https://s3.amazonaws.com/jemazejodep/97831527330.pdf
    • https://uploads.strikinglycdn.com/files/74b8cefe-e578-41f4-9197-37322d160948/mokevemisipome.pdf
    • https://s3.amazonaws.com/bawalidamovidud/unblocked_mario_games.pdf
    • https://uploads.strikinglycdn.com/files/bdcc5838-36c2-4c1d-aafb-37055ca41c77/hackers_mod_apk_1.208.pdf
    • https://uploads.strikinglycdn.com/files/6249b8ac-3861-41c5-9f98-224a41895ee3/pikomej.pdf
    • https://s3.amazonaws.com/senodiw/94520699106.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b19.bin
5f28bd784c927d60aec1d872cbb3696db4f60e89c8e1c22f93e3862eefff89cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 5224 bytes
font_01_sfnt_off00011d0f.bin
b83a7cd64c8b16218fc46eff6fdc2123425a570999e9852429783fa544b6496d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0F 11240 bytes

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