Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f0e263299612a4…

MALICIOUS

PDF

97.8 KB Created: 2021-04-05 17:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: bb50e20fe552a5320a21c6490923354a SHA-1: 247bd7760e231e9c522a9ee8b0fb8b02f8880231 SHA-256: c9f0e263299612a40ad44ea8d2ee8549db0575325060da586716f9f3c73a467a
126 Risk Score

Malware Insights

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

The PDF file is flagged by multiple heuristics, including ML classification and ClamAV, as a malicious phishing trojan. It contains an embedded URL that leads to a suspicious domain, likely intended to host or redirect to malicious content. The document body, though heavily obfuscated, suggests a lure related to 'Venn diagram explained pdf'.

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 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://bologen.ru/strik?utm_term=venn+diagram+explained+pdf PDF link annotation
    • http://nejuwenazi.iblogger.org/bunowigopudajorudigox.pdfIn PDF document text
    • http://gilitomenuxame.22web.org/farorewaz.pdfIn PDF document text
    • http://gukibiminaz.iblogger.org/94285262593.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9ebe09d-2c02-4b6e-ba4b-27bed2665c16/83753569077.pdfIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_9b1dbdddfe4f4bfba2b447a250e18ed9.pdf?index=trueIn PDF document text
    • http://daboloxasorun.rf.gd/leziradovudevax.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/vezedamexatanesul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76132bf9-8864-4ce4-a28e-aecd9453e827/sennheiser_hdr_120_ii_wireless_headphones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ee572d3-957c-4895-a5b7-6b6ae78662e6/tumafonorawidurofosebotu.pdfIn PDF document text
    • https://f6ce3cfb-f922-470c-9e0e-eaf724001b0e.filesusr.com/ugd/defcb2_88507f2ff7224083ba3c0afb98559447.pdf?index=trueIn PDF document text
    • http://tumutit.epizy.com/biochemical_techniques_lecture_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/i_pace_speed.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/64334396752.pdfIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_b7b2270cd001463cac5bc52ba939d9c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a0ae941-8f44-4156-90fd-7b8805bfb28e/why_is_my_ue_boom_not_connecting_to_my_iphone.pdfIn PDF document text
    • http://repazof.rf.gd/cae_exam_use_of_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea8b2e1b-a704-418a-87a6-e94f826dd292/96254142422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/575a9cf9-2c91-4b69-8b93-a551302a1181/bissell_proheat_2x_manual_pet.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/korujikademok.pdfIn PDF document text
    • http://kifowusaw.epizy.com/human_anatomy_atlas_2019_app.pdfIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_570d0f2c977c443cbc7febeb0e50ea17.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001281b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281B 5216 bytes
SHA-256: d1eb4997aa68631faa65ec74c29e0e8706ef343cc783295cb91f375b20921513
font_01_sfnt_off000139d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D3 12396 bytes
SHA-256: b3ce3f7ffaa2c6226ab4bfa4b4f11984ce8f768316454954db87737838ac90e4
font_02_sfnt_off00016338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16338 16320 bytes
SHA-256: 19422e69d26ed94c8fefecf6edd739ec729bb609290aa2ffa3c2c81626ac2914