Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c48a92a31744b2d…

MALICIOUS

PDF

126.9 KB Created: 2021-04-28 09:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 521838734bb17e92127bf3c3735030cf SHA-1: eb1c2aadce9e7b0520e7c05e880ebd312e6951a8 SHA-256: 6c48a92a31744b2d7d6976583ec0e3aed40b3bf7931cfa339dec5115093583f7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URL `https://xajibur.ru/strik?utm_term=un+curso+de+milagros+audiolibro+capitulo+1` is likely the primary malicious destination, disguised as an audiobook chapter. No scripts were extracted, but the PDF structure itself is used to host and link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://xajibur.ru/strik?utm_term=un+curso+de+milagros+audiolibro+capitulo+1 PDF link annotation
    • http://lnstagramcopyrighthelps.com/acoustic_blues_guitar_licks4syc6.pdfIn PDF document text
    • http://gbarb.me/kiribobivolegozacfg.pdfIn PDF document text
    • http://ruxuzosok.mywebcommunity.org/83482204959.pdfIn PDF document text
    • http://tcerkovniekupola.space/tolinupklay.pdfIn PDF document text
    • http://jixazepo.mywebcommunity.org/80756922124.pdfIn PDF document text
    • http://livethailand.fun/gemulisewunujutojuj5me31.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vukujidor/92049823052.pdfIn PDF document text
    • http://nomamazuzut.atwebpages.com/23890784351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/965b3423-9190-45da-9152-b71bcfd26621/napiporonenos.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/number_location_tracker_app.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/anthony_dasan_video_songs_free.pdfIn PDF document text
    • http://rovizomaguwex.atwebpages.com/buku_akuntansi_keuangan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a3f76cb-950a-493d-a3a3-990f8d0f0499/write_the_outer_electron_configuration_for_alkali_metals.pdfIn PDF document text
    • https://bc732cde-fb09-4fee-8ab5-c82a45a1131b.filesusr.com/ugd/2ac701_052739a2e7734274ae0665107521f90f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejados/where_can_i_donate_crochet_items_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/why_does_my_dell_wireless_keyboard_stop_working.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/tankless_hot_water_heater_buying_guide.pdfIn PDF document text
    • http://fidegaf.atwebpages.com/diagnostic_microbiology_laboratory_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaporam/14322445138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2019862f-c27c-4a1d-bb76-704073d64ab5/xadozej.pdfIn PDF document text
    • https://2dcb0092-dd22-4cef-90c1-8c398f802bb7.filesusr.com/ugd/ff3115_bc62e3e77c9c491c967f76e9fdfb4ec9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gumagabu/tuzatuxesup.pdfIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_ee63b1f56c6940cfb557f02341a7d767.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad913161-947d-4722-b53b-3da5d1b73335/70224974845.pdfIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_115adf5b3f39492b82961c56769b948a.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_off0001b0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0E9 5576 bytes
SHA-256: 60b38a77a5d8d26c00272082bff9d83ec91067a0c6c7e90af917523a6bba34d7
font_01_sfnt_off0001c3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3CA 12320 bytes
SHA-256: b68ad7c5f221278087b833c7475f8273d9630b051148ded3d14c2374a8f6f001

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