Malicious PDF — malware analysis report

Static analysis result for SHA-256 b979c11cde17815e…

MALICIOUS

PDF

103.0 KB Created: 2021-03-16 17:17:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54be51e683de4b7d9e0a7a0a9f8c2be1 SHA-1: e0d3f92c9bbc30b2ba8f50ffb79badb34ae81bbf SHA-256: b979c11cde17815e97c09d916da555f9d6046f45b8032e6356950f220c402d36
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the presence of a malicious URL within the document body suggests an attempt to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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 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://vilenefex.ru/strik?utm_term=don+juan+canto+1+summary+in+bangla
    • https://static.s123-cdn-static.com/uploads/4379222/normal_5fe1d77068524.pdf
    • http://nanewak.iblogger.org/timadolimola.pdf
    • http://nisobetumiminiz.iblogger.org/jugigisu.pdf
    • https://static.s123-cdn-static.com/uploads/4407066/normal_5fc7452076524.pdf
    • https://cdn-cms.f-static.net/uploads/4498997/normal_601b186c5ba2b.pdf
    • https://static.s123-cdn-static.com/uploads/4412891/normal_5ff1180c89d1c.pdf
    • https://cdn.sqhk.co/kototokim/iijbiej/fishing_paradiso_mod_apk_terbaru.pdf
    • http://kevotefanevodaw.iblogger.org/russian_english_dictionary_of_verbal_collocations.pdf
    • https://static.s123-cdn-static.com/uploads/4410679/normal_5ff8f1c188560.pdf
    • https://cdn.sqhk.co/kisunika/eY5UgeX/gas_prices_in_california_october_2019.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_5075d9b41a464aa2bb2cfdcb1fe7866b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a21d44ec-a621-49dd-9efc-45d4619169ff/19210844700.pdf
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_b7115113a0a940d1bc7f073f27001022.pdf?index=true
    • http://zowetoxugikar.epizy.com/61736686758.pdf
    • https://uploads.strikinglycdn.com/files/112cfb12-75fb-40ba-9fc1-be225e17af4a/89317922171.pdf
    • http://jolimijevu.epizy.com/is_flipping_houses_a_good_investment.pdf
    • https://uploads.strikinglycdn.com/files/57335696-7edd-4e53-a439-8ca7533ab7ae/56099063470.pdf
    • https://8c4778c4-ed17-4cf1-86f9-5448e21c5c15.filesusr.com/ugd/6da380_6a2b1db8e8df4330aac557b64a9deefd.pdf?index=true
    • http://legofebufulemo.rf.gd/100_green_smoothie_recipes.pdf
    • https://uploads.strikinglycdn.com/files/3ba2eeda-1451-436d-8c86-9ab9bdd10b8b/plantronics_m180_earpiece.pdf
    • http://favuzokusom.rf.gd/nba_steph_curry_injury_report.pdf
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_45c152c823a94b34ba2f1d79e7af862e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ea4a4e44-3f18-4ee0-98b0-27fe32eb2ff6/how_to_charge_jlab_bluetooth_earbuds.pdf
    • http://zatafefot.rf.gd/46842979549.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001148f.bin
29c9fa698eeeeb9684bf121948384ee9fa2d47bbc796adb4aba2a831b2920f49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1148F 5488 bytes
font_01_sfnt_off0001273a.bin
0fd374e28fe4f79accc4e414232251503ee1c61e65706a7794ddb4aa098411ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1273A 28748 bytes
font_02_sfnt_off00016e48.bin
4cec84265fcf2b7535b9782731718b18c9a361c866bcc8fa689940089267375a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E48 9512 bytes

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