Malicious PDF — malware analysis report

Static analysis result for SHA-256 c728d3fe191c3bcc…

MALICIOUS

PDF

73.1 KB Created: 2021-03-16 10:50:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4515529258db950110365b977e0354ee SHA-1: a4f1275efbb4b9e65045745a96a03dcd242fd6be SHA-256: c728d3fe191c3bcc0850142d63a8dcad627a35799e3b89788266cc201a55a8d3
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 are disguised as legitimate documents, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect the user to malicious content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=kenmore+convection+oven+not+working
    • http://dalidusiz.mywebcommunity.org/sopamudazokorape.pdf
    • https://cdn.sqhk.co/gebunemif/9hfhc44/best_of_2020_songs_english.pdf
    • https://cdn.sqhk.co/jimikafede/tiigfMU/residual_value_formula.pdf
    • https://cdn.sqhk.co/valujoper/hj3usjj/how_to_raise_a_child_with_down_syndrome.pdf
    • https://cdn.sqhk.co/mojazejo/iyieibW/3347275312.pdf
    • http://teagreen.space/bill_bottom_farm3ed8i.pdf
    • https://cdn.sqhk.co/mivufarowiwi/hfjfglR/quiz_3_the_roman_empire_quizlet.pdf
    • https://cdn.sqhk.co/wamedexipun/Cgjihif/top_instagram_gain_followers_app.pdf
    • https://cdn.sqhk.co/rigepasemapa/gfgcz4T/savexuluna.pdf
    • http://rmk4sale.xyz/ti_89_titanium_matrix_solvercaako.pdf
    • http://repair-planshetov.ru/lebaxufatavexuzonepanagewmdmy3.pdf
    • http://sewakasatixori.medianewsonline.com/62885769773.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_0fc61df0aa69401b91652ee96770b40d.pdf?index=true
    • http://xasagode.myartsonline.com/dugiwefeweg.pdf
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_f68e38931d874365829de26de1ef6668.pdf?index=true
    • http://vufobaratoja.epizy.com/26839894071.pdf
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_095e93e7b8ef4d9ca32f8a79d80218cf.pdf?index=true
    • http://dumatefofexulen.epizy.com/lupazemojosoribixomusur.pdf
    • http://varaxekewuveza.epizy.com/zafumuwudorawakoful.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_off0000e16c.bin
d09a7158005ee894c255a0c0feed0d2f3b659048c65490ec0890af5588548329		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 4884 bytes
font_01_sfnt_off0000f20d.bin
6a0800429b6ab586dc15d1cd02782f87aa925096c7a93a2927538772735b48da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF20D 10800 bytes

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