Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e40521385a25533…

MALICIOUS

PDF

96.2 KB Created: 2021-03-16 06:37:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b69d275811ecdee948d6a2a2ab7e5116 SHA-1: a4e4bed4698906b430a16c8aba088a1093e498e0 SHA-256: 0e40521385a2553379bbf14fbef3bcb36c813249591a61c6c08efe9e7d07933e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal it contains a large number of external links, suggesting it's part of a link farm or SEO spam campaign. The embedded URLs point to potentially malicious sites, likely used for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

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-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://soxebez.ru/wix?keyword=cookie+clicker+unblocked+at+school
    • http://goloszauniver.fun/59486212103udosc.pdf
    • https://widedopeb.weebly.com/uploads/1/3/5/9/135970132/porexen_belomoza_jozazebonotiz_julekasisolega.pdf
    • https://muzunamarufo.weebly.com/uploads/1/3/4/4/134463020/bojajozepabexo_lewerux_nepofurosulosu_jojajego.pdf
    • http://bettermoneytips.com/functional_analysis_and_graph_theoryh07mu.pdf
    • https://dikozawurizid.weebly.com/uploads/1/3/1/6/131637316/danoxa-zegowuvawel-revubimifal.pdf
    • https://silepokow.weebly.com/uploads/1/3/4/3/134366863/fijibukofupu-rufeguf.pdf
    • http://mazafaka69pussy.online/xababisiv2lys.pdf
    • https://static.s123-cdn-static.com/uploads/4372086/normal_5fe1021c5d8b0.pdf
    • https://static.s123-cdn-static.com/uploads/4451940/normal_5fff95e2ee94f.pdf
    • http://minuette.me/xaziderap84n86.pdf
    • http://volosaty100.xyz/can_you_use_imovie_on_ipad_prodxvji.pdf
    • http://ranopefutaranuj.iblogger.org/45000324987.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vipaviveza.epizy.com/sonic_all-_stars_racing_transformedtm_demo.pdf
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_082ddb6fccbf476080f5d26799900e26.pdf?index=true
    • http://favigawesuwevo.rf.gd/rogefiwifig.pdf
    • http://xewaditina.epizy.com/atem_television_studio_pro_hd_user_manual.pdf
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_e60ef653f9e348abbed019cab2fe215a.pdf?index=true
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_57072c8501ac45a8a34b8422b3cd2852.pdf?index=true
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_172c13cd537842e6840877b0447370bf.pdf?index=true
    • http://vominobig.rf.gd/anti_ragging_form_meaning.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126f5.bin
f6d8f0c111dd8b7acea4675c0ab710aee574dfbde482b739aef85f37a17f2c37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126F5 6832 bytes
font_01_sfnt_off00013843.bin
1b228282bc2fbe2da2322802d7e544ef8d956244931ae6684c5cb96cb1bae5f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13843 5136 bytes
font_02_sfnt_off000149aa.bin
a01bd73889986190323a077657778fb085cc74189cab1b71ac98c99b6e7b9112		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149AA 12008 bytes

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