Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a2e9de1a9bf49a…

MALICIOUS

PDF

92.6 KB Created: 2021-05-11 11:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 39750353babf9ee10f2f40c3e9e6d50c SHA-1: 62d930f471e54e32bb573102bba6d444190b642b SHA-256: 98a2e9de1a9bf49a03698e2c4cb11d6fcb15d443619fc04f9bd664ec3d8e5f39
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on 'resalured.ru', which is flagged as a link farm on disposable hosting. ClamAV detection and ML classification strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=how+to+use+ba+ii+plus+to+calculate+standard+deviation+with+probability PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464873/normal_603f6563e400e.pdfIn PDF document text
    • http://sell-toclick.online/advanced_mathematical_concepts_precalculus_with_applications_student_edition96gbf.pdfIn PDF document text
    • http://tozidak.mygamesonline.org/kemper_profiler_stage_case.pdfIn PDF document text
    • http://rasipafus.getenjoyment.net/superhero_coloring_pages.pdfIn PDF document text
    • http://mazikopipovix.mywebcommunity.org/42597685059.pdfIn PDF document text
    • http://brumbum3.xyz/96309760016q1q7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367665/normal_600767b938288.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/arduino_starter_kit_francais.pdfIn PDF document text
    • http://parovosi.mygamesonline.org/traditional_cinderella_story.pdfIn PDF document text
    • http://malanefire.sportsontheweb.net/93316615751.pdfIn PDF document text
    • http://legionmone.xyz/fundamentos_de_enfermagem_potterggliy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481522/normal_601615b2ce97f.pdfIn PDF document text
    • http://samozanyat.info/25685326349zlm4h.pdfIn PDF document text
    • http://dororuminaxa.mywebcommunity.org/nuwubafowowoso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/folder_colorizer_2.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/how_to_find_fgx_calculator.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/fegafukapi.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/dr_seuss_beginner_book_video_hop_on_pop_vhs.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001116c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116C 5396 bytes
SHA-256: 0214681165a424071bc67c519be8427614370bba79765e0c596532a747f83cd9
font_01_sfnt_off000123bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123BD 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00012c4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4B 12296 bytes
SHA-256: 2cd811f45110a446c4c2ce9d29dd857d8426c0cfb812d7370ffebaabac76f951
font_03_sfnt_off0001563c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1563C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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