Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b54d64994d0be94…

MALICIOUS

PDF

84.8 KB Created: 2021-03-30 17:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b403d5be69c2c5aff0649013a44c4024 SHA-1: 23108971e3981f3f12bd765bb77b8c055552b873 SHA-256: 1b54d64994d0be948d5cd5cdc27405f75103eadf9195f5848a322adb0e492e0d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are associated with link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, likely for phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious verdict, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://jumiwimov.ru/123?utm_term=bridge+of+spies+full+movie++480p PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378830/normal_5fdab9ef56e8b.pdfIn PDF document text
    • http://ravasixojodari.mygamesonline.org/thyroid_function_test_biochemistry.pdfIn PDF document text
    • http://gifagudilul.mypressonline.com/glossary_of_trade_finance_terms.pdfIn PDF document text
    • http://rubisteq.online/what_is_artificial_intelligence_system5936d.pdfIn PDF document text
    • http://usacreditmonitoring.info/warriors_dont_cry_summary_chapter_11f9fqq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489058/normal_605516d258355.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/fajujaxupe.pdfIn PDF document text
    • https://rudozusaviso.weebly.com/uploads/1/3/4/0/134041113/4469516.pdfIn PDF document text
    • http://kovamuwaropepu.getenjoyment.net/94240924785.pdfIn PDF document text
    • http://rijunoje.mygamesonline.org/xoxurilide.pdfIn PDF document text
    • http://cparta.moscow/lapejakuxadusobg8q2.pdfIn PDF document text
    • http://lazokiwumemo.mygamesonline.org/math_worksheets_for_grade_4.pdfIn PDF document text
    • http://lnstagramsupportinfo.com/7671105329fvqef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383340/normal_6019dbe4d700c.pdfIn PDF document text
    • http://axecheat8.xyz/colliding_continents_answer_keykgori.pdfIn PDF document text
    • http://udilische.club/latest_odia_bhajan_song_free6qji5.pdfIn PDF document text
    • http://jevafurevozu.mygamesonline.org/malatidujomer.pdfIn PDF document text
    • https://wafiludelo.weebly.com/uploads/1/3/1/4/131437380/3145050.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419836/normal_5ff296d3a2fcf.pdfIn PDF document text
    • https://jumewabob.weebly.com/uploads/1/3/0/7/130775497/1424938.pdfIn PDF document text
    • http://baltika-trans.ru/somasubar8awss.pdfIn PDF document text
    • http://ergors.space/under_the_dome_season_3_episode_13_sub_indoesw4l.pdfIn PDF document text
    • http://badgesverified.com/dutuzikefarenripd4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/38420273015.pdfIn PDF document text
    • http://kaxuwenewutexu.myartsonline.com/all_mathematical_symbols_with_name.pdfIn PDF document text
    • http://wufikemofumop.atwebpages.com/accountancy_class_11_chapter_3.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 6744 bytes
SHA-256: ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425
font_01_sfnt_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 5684 bytes
SHA-256: bf9b0906cf9033e54dabc484a02f76e78327ad493737ec7925d0db83d5939f9d
font_02_sfnt_off00011239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11239 2116 bytes
SHA-256: 8db65adc699bed2ed4e99b174e414cace916d9ae25f4e5597e3d94de4d1667c8
font_03_sfnt_off00011be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE1 11508 bytes
SHA-256: 1439d4c2a047e0d9b43834127366bc45d42590e3ce3a2f66d888a59924f6524b