Malicious PDF — malware analysis report

Static analysis result for SHA-256 b107fafdff3f3017…

MALICIOUS

PDF

78.5 KB Created: 2021-04-09 19:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 088e5ef63d120914ba4809d2850106b6 SHA-1: aca663a5a0b6b50365f0e6ed7fb5846d61b7061b SHA-256: b107fafdff3f3017e22859462f37475ea9587a058d5bd024b1316f49014163c6
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that is likely used to host malicious content or phishing pages. The presence of external URIs and the overall structure suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://golowaki.ru/strik?utm_term=league+stuck+at+96 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4426967/normal_5ff487379b3e1.pdfIn PDF document text
    • http://fagogit.sportsontheweb.net/wewutepigotuduzapotusex.pdfIn PDF document text
    • http://helpcopyright-service.com/kajamecgdc.pdfIn PDF document text
    • http://interbank.link/resumen_de_la_obra_cien_aos_de_soledad_por_capitulos_wikipediacu3t3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497079/normal_6032e4d451357.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/beowulf_online_subtitrat_2016.pdfIn PDF document text
    • http://gilumesu.mypressonline.com/jikisogojafonamuzik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379722/normal_5fde04aa6ba71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472484/normal_5fdf0ef688163.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/88345431541.pdfIn PDF document text
    • http://digtalcaliper09.xyz/how_to_hook_up_rca_soundbar_to_element_tv6munx.pdfIn PDF document text
    • http://shtancircul.site/n_t_d_full_formhlvox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412582/normal_601deba91a8e7.pdfIn PDF document text
    • http://logunej.iblogger.org/60027305111.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/sifawekujiki/writing_sample_for_college_admission.pdfIn PDF document text
    • https://cb705b04-a904-4f11-a6d0-9d7e2b1ae5cb.filesusr.com/ugd/53498d_19fd0ede2e8c4b3aa90f71b952bab87c.pdf?index=trueIn PDF document text
    • http://ligeziwofumupo.epizy.com/zegebigizijadobaba.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_1b52caf584ba4191b56e25952c98f6ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/titugome/the_four_feathers_book_summary.pdfIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_5000505dfb2a4413878e58b43fd17847.pdf?index=trueIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_8f60d0ca19f84955b9405a611333c374.pdf?index=trueIn PDF document text
    • http://fofanab.epizy.com/zavod.pdfIn PDF document text
    • http://finezifor.rf.gd/m-audio_fast_track_c400_control_panel.pdfIn PDF document text
    • http://gesutebixip.epizy.com/62745295805.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/habits_of_mind_posters.pdfIn PDF document text
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_bd246ce9f3b24f1ba00410262a6cbc91.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_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 5152 bytes
SHA-256: eba1d0a205e4ee0bba0f6652e8dc9fb8f3527beee19d1f5d3b292feb71dfc305
font_01_sfnt_off000104d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 11384 bytes
SHA-256: f0e3d6532e6929495f2a444b48aa0e9d50a7b2ea4e0c11439209b9d49266474d