Malicious PDF — malware analysis report

Static analysis result for SHA-256 359681fc7e124b92…

MALICIOUS

PDF

79.0 KB Created: 2021-04-06 13:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0ecd714b2a488b887e688a522a3d26fd SHA-1: c1bcc659244ba4f133348e0d34bb57c6eee58354 SHA-256: 359681fc7e124b9213c3f6be9fb4363b4c23323b57ac507e8acd984d31b8c1f2
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'Smile camera app', likely a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/123?utm_term=smile+camera+app PDF link annotation
    • http://itagreen.fun/50870718056baxv0.pdfIn PDF document text
    • http://setopin.mypressonline.com/what_are_three_examples_of_in-memory_databases.pdfIn PDF document text
    • http://habercigo.com/xugetibivubobuxavoth0v2.pdfIn PDF document text
    • http://juvizex.sportsontheweb.net/example_of_mean_median_mode_in_statistics.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/57040839895.pdfIn PDF document text
    • http://immorta-cross1.club/xeroribumewuzotelozg0pvl.pdfIn PDF document text
    • http://lilubaxubaxulu.sportsontheweb.net/63417611893.pdfIn PDF document text
    • http://bigops.fun/how_to_get_good_at_marvel_contest_of_champions21e3b.pdfIn PDF document text
    • http://givimemaregudum.sportsontheweb.net/elementary_biology_vol_1.pdfIn PDF document text
    • http://groshyk.site/jajolusezepifedudakomoba01h5.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
    • http://xamukipadu.myartsonline.com/derikezufibiveleku.pdfIn PDF document text
    • https://5057b38b-f250-4925-a5fd-2dbc054a2c1f.filesusr.com/ugd/25ee37_f01b2df1353b4fbfbf06851cd02bd0c3.pdf?index=trueIn PDF document text
    • http://jumawivowibeb.onlinewebshop.net/dewiguzomefota.pdfIn PDF document text
    • http://musovulazapa.epizy.com/83921263583.pdfIn PDF document text
    • http://gewumene.epizy.com/shrink_file_size_online.pdfIn PDF document text
    • http://zaleponijodo.epizy.com/48106376437.pdfIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_e633b5219bb14341afeaa1f3d574a002.pdf?index=trueIn PDF document text
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_c39b72d50b724ee4b89609c94bd0bca7.pdf?index=trueIn PDF document text
    • http://pekomuvave.myartsonline.com/fadek.pdfIn PDF document text
    • http://xoxekojut.onlinewebshop.net/banking_financial_services_management_notes_for_mba.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_dd2402926b14437398b05fdafbe688ee.pdf?index=trueIn PDF document text
    • http://sukijikulo.epizy.com/bbg_workout_you_can_do_while_pregnant.pdfIn PDF document text
    • http://xerunutogufoj.epizy.com/88617057804.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7F 4496 bytes
SHA-256: 4068d5a3c7751013a40870eb8e7c37acb03f21c13a59010e8bdc2a745d943212
font_01_sfnt_off0000f9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A6 11800 bytes
SHA-256: a05dac5ae1b0c351bae355220eceaa755a33198289dcd5849ba54e3bf502e781
font_02_sfnt_off000120f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F0 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378