Malicious PDF — malware analysis report

Static analysis result for SHA-256 43eb14f65d56d894…

MALICIOUS

PDF

86.1 KB Created: 2021-03-18 11:09:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 3d4c3c0785a4cbc1ac2ed11f279ef19e SHA-1: 499f290d966a79b4488ce3224d1e818737b1a86b SHA-256: 43eb14f65d56d894227f706fc364efe9b95ac772f3089c4272ce3390c4e30d5c
126 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or redirection attempt. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic firings indicate an attempt to direct the user to malicious external content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://golowaki.ru/strik?utm_term=asus+p8z77+v+lx PDF link annotation
    • http://keluzizizeroki.getenjoyment.net/allahabad_high_court_aro_paper_download.pdfIn PDF document text
    • https://mufamemibota.weebly.com/uploads/1/3/1/8/131856380/paravujelagumok_rizazawo_tobujaxeximiluk.pdfIn PDF document text
    • https://famuzupowaja.weebly.com/uploads/1/3/1/4/131406758/1bfe126e0fc8.pdfIn PDF document text
    • http://rufoferapavinew.medianewsonline.com/cadbury_report_summary.pdfIn PDF document text
    • https://suxutusebosogu.weebly.com/uploads/1/3/1/3/131379987/31009759e841df.pdfIn PDF document text
    • http://lefibipefazefep.mypressonline.com/58673726665.pdfIn PDF document text
    • http://wefilevazobakeb.mypressonline.com/anexarea_crimeei.pdfIn PDF document text
    • https://tirilume.weebly.com/uploads/1/3/4/8/134886795/figosokuwi_kitoj_gorepodawarasor.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/honda_gcv160_mower_parts.pdfIn PDF document text
    • http://tadidavazutopa.sportsontheweb.net/distance_rate_time_formula.pdfIn PDF document text
    • http://mitimewigupito.mypressonline.com/49030461933.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/android_browser_with_dark_mode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63143773-1618-4e55-b64e-1ef486897b43/pentair_intellichlor_ic40_cell_cleaning.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/chameleon_phone_apk_uptodown.pdfIn PDF document text
    • http://dokixogutezone.rf.gd/abbyy_transformer_12.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/porofapipenotodivoret.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90329b9d-43dd-4515-bde7-495f32717031/ishmael_daniel_quinn_book_depository.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5122a46b-ee5e-499e-a622-d2d35e32e87f/timex_ironman_watch_reset_chronograph.pdfIn PDF document text
    • http://safedoguno.onlinewebshop.net/76568488644.pdfIn PDF document text
    • http://fadezanunadafik.myartsonline.com/how_to_find_the_mass_of_one_sulfur_atom.pdfIn PDF document text
    • http://bupikizatigog.rf.gd/8753492158.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/catch_platform_construction_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b24300c3-41cb-48b1-8504-a9f0836fb9e9/maximum_ride_books_manga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1516487e-7e84-4295-904a-68b14f64ed21/we_the_arcturians_a_true_experience.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF875 4948 bytes
SHA-256: aac921db092e237eb86e6743a6c56a79e096085a2e17c149f1b72b9d327bb3b5
font_01_sfnt_off00010974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10974 6044 bytes
SHA-256: 69431030c21c5817d37244909f178e0ea9985a8fe37dddd09e42d7bbee290089
font_02_sfnt_off00011912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11912 17032 bytes
SHA-256: cf484c977491dcbaa8f1f33094c103d647eddccee97a8828e3264c972b989962