Malicious PDF — malware analysis report

Static analysis result for SHA-256 af040b10e8479ab5…

MALICIOUS

PDF

72.6 KB Created: 2021-03-26 08:20:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1aa1553c995746c2278f36e90bb02fb4 SHA-1: 14b7fe6610b9471d8177b56877604d6b2484ee4e SHA-256: af040b10e8479ab5c348535b6fa4c6714fc0bc4f7961fa04aa11c9c5cfa84034
192 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/wix?keyword=instagram+post+template+worksheet In PDF document text
    • http://bufezipuduxev.mywebcommunity.org/supreme_student_government_constitution_and_bylaws_deped.pdfIn PDF document text
    • http://pumorux.medianewsonline.com/biology_book_class_10.pdfIn PDF document text
    • http://mezazasakejel.iblogger.org/accordatore_chitarra_per_android.pdfIn PDF document text
    • http://ladekepevij.mygamesonline.org/zutidemiwakalun.pdfIn PDF document text
    • http://vawabipoxe.sportsontheweb.net/diagnosis_asma_pada_anak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lejipuzab.epizy.com/how_to_use_e_on_ti_30x_iis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39742280-68d0-4aed-8622-2de3e5fd6939/zofadawa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2938a969-df11-4bea-857d-dfb92168b3b1/conversation_with_god_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/000b905d-1234-43a7-8638-ae56d1f45d80/43515306025.pdfIn PDF document text
    • http://vejimugar.epizy.com/spring_cloud_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66c41f7d-46d0-487e-b6cf-92c95b09136e/68214993208.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9531b14c-aa1a-4234-bcf0-02c9ef0e391b/22665429561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d90aa41-be21-45b2-bb1d-58b483b15b87/dodge_ram_repair_dubai.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf1e6371-df57-43c1-bb3f-a2dd3bcea202/96729287487.pdfIn PDF document text
    • http://noderukun.epizy.com/biblical_theology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93a52d85-6f74-49f5-8779-088bdd65ff64/fifty_shades_of_grey_full_movie_fb.pdfIn PDF document text
    • http://jimakobogugiwa.epizy.com/dodusamujeguvukasugaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d29440-6439-489e-a3f6-c2569cafc0ac/law_enforcement_sniper_training_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3e3efe1-c240-4ac1-bb43-f630343c2e5f/nojerobuvufezizanavozilol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da93d25b-2331-40ca-945b-5dbbfb11cac5/64910728887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a00b5d4c-292f-4291-b2a9-6e71c8221295/55716596942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0fdb30f-e2e9-4924-8852-cde5b1cc5204/we_cant_stop_we_wont_stop_miley_cyrus_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/787eda9a-97f4-4a48-926d-1c8ce31a0e5b/nutafobudisoket.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6f64caa-bd47-49a3-983e-e3d08ef9fb88/prepare_the_journal_entry_to_record_the_issuance_of_the_bonds_assuming_the_bonds_were_issued_at_101.pdfIn 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_off0000df29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF29 5328 bytes
SHA-256: b7507b8bf7d38ed05d016974d7cb7f492fe480da2f44f10ec5e12fd38a2617ea
font_01_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 10364 bytes
SHA-256: 4afd4127954a01a765d30c474c94c41382b52e5aa7c8e55820dad2f43b819b3e