Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edeb79c1f668c7e…

MALICIOUS

PDF

79.3 KB Created: 2021-03-14 06:10:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c377b97246153246b80f9cc95868aeff SHA-1: d687ca04fbb352f6cd9a16aa1823130d5017f8f6 SHA-256: 9edeb79c1f668c7e143e4f77a63c578ab6b304ddc1f18332e2fe46bb8cc316e2
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous URLs that point to external sites, with at least one identified as a malicious redirector. The document body is heavily obfuscated and appears to contain metadata rather than user-readable content, suggesting its primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://crophysi.ru/strik?utm_term=recipes+for+air+fryer+frozen+french+fries In PDF document text
    • http://bolawixefop.mygamesonline.org/gaxurevi.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/16f4a06.pdfIn PDF document text
    • http://winfreeiphone.xyz/41785300762xx2qo.pdfIn PDF document text
    • http://kaxavetaxudu.mywebcommunity.org/tufawidinavikuxovoragif.pdfIn PDF document text
    • http://merotudonor.mypressonline.com/what_does_visual_culture_include.pdfIn PDF document text
    • http://dazolovegom.mygamesonline.org/bekolutetupo.pdfIn PDF document text
    • http://mareson.getenjoyment.net/the_art_of_loving_erich_fromm.pdfIn PDF document text
    • http://rigoditibalun.mywebcommunity.org/how_to_use_a_coordinate_plane.pdfIn PDF document text
    • https://zikowipon.weebly.com/uploads/1/3/5/3/135300096/8982368.pdfIn PDF document text
    • http://sarhello.online/domestic_worker_retrenchment_letter_template_south_africa5cx5r.pdfIn PDF document text
    • https://xakivemo.weebly.com/uploads/1/3/0/7/130739368/foduvoturopive_gisagimaxebiv_gevakus_salewuwis.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/a.m._best_homeowners_insurance_company_ratings.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://37991ae0-d72b-4ccf-bf90-288dedd591e7.filesusr.com/ugd/041b56_8c55665e89d84abbb74da4c705d0062f.pdf?index=trueIn PDF document text
    • http://gixiluvigatekij.atwebpages.com/megavidiravur.pdfIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_61d59e237c0b43999dc569b9eaeb52ba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd2ab4b9-8c66-4c0d-9de0-736bf268a618/18679181282.pdfIn PDF document text
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_b8c675dbb00c4597880ac33632962dcf.pdf?index=trueIn PDF document text
    • http://kepawomokatuke.myartsonline.com/pride_and_prejudice_full_movie_2005_putlockers.pdfIn PDF document text
    • http://satawakerexe.atwebpages.com/34504462219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c79d86-f78a-4bde-be00-21130e941e11/how_to_charge_citizen_eco_drive_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c365da2-6ddf-44da-92f4-51caea7f759a/45385873942.pdfIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_2e465f2dcbe74e0b8315a692a2b67d47.pdf?index=trueIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_2e70f35c1fc948989f07a239b396f535.pdf?index=trueIn 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_off0000f26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 5228 bytes
SHA-256: 26fde474dda96fc2c2c9c92ce7bbfc0308d544c09a9925a2bf94a2dbd66e3578
font_01_sfnt_off00010447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10447 12148 bytes
SHA-256: 7343ac6d2e93e2667d52d3d0d67ef396325598b0ac72a588b758ec5aa6af661d