Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c658d5f7fa9061f…

MALICIOUS

PDF

95.6 KB Created: 2021-03-28 07:37:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3b758865b3151f3204fe9094e015a50c SHA-1: a68f71f29e3cfb92cc3d28970aa6424842f079d4 SHA-256: 2c658d5f7fa9061f8436d2a7dd399f207039b319c12132e61b2f944a60ab8398
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final destination. While no scripts were explicitly extracted, the presence of external URIs and the ML classification strongly suggest malicious intent, likely to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://resalured.ru/wix?keyword=dirt+devil+ultra+vision+turbo+user+manual PDF link annotation
    • https://pezufefak.weebly.com/uploads/1/3/4/8/134865979/611787.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474475/normal_5ff6af477094a.pdfIn PDF document text
    • http://topepuxabi.iblogger.org/bible_in_greek_and_english.pdfIn PDF document text
    • https://cdn.sqhk.co/loberutebe/6XiggiW/sojik.pdfIn PDF document text
    • https://xanusirotenil.weebly.com/uploads/1/3/1/4/131407364/673a627cbc465.pdfIn PDF document text
    • https://cdn.sqhk.co/padixemugex/KiFhhvK/metasawesunev.pdfIn PDF document text
    • https://tudekazesabi.weebly.com/uploads/1/3/4/3/134367585/5988348.pdfIn PDF document text
    • http://memisada.mygamesonline.org/tafexekepav.pdfIn PDF document text
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/bavujekodik_tevupaz.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/oXhiAhi/geo_book_3_charger.pdfIn PDF document text
    • https://takibuvekinapix.weebly.com/uploads/1/3/4/4/134456834/2c5e6229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470839/normal_60141f0e9fdee.pdfIn PDF document text
    • http://lalixodurabemu.iblogger.org/grade_4_grammar_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_6021d54fb8293.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/fdSYggj/water_slide_bounce_house_sam_s_club.pdfIn PDF document text
    • http://rexuwoxaga.sportsontheweb.net/toditepimokopovodoxazujem.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/6680932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446034/normal_602ea6f345b5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bugazepoja.onlinewebshop.net/dewebolamun.pdfIn PDF document text
    • http://temimakidifidib.rf.gd/saturated_and_unsaturated_solutions_pogil.pdfIn PDF document text
    • http://lojibovel.myartsonline.com/47390400562.pdfIn PDF document text
    • http://bonizeza.epizy.com/967693863.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12567 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off0001355b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355B 5172 bytes
SHA-256: 0fc362510ba6e867ef87eb73136e9e7ef95f32bc98fe6276a218832384d6b38d
font_02_sfnt_off000146df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146DF 12580 bytes
SHA-256: af18ff5363d0933fa76a6b3b61fa57641aaf1e2eb7c361c73c4ab8194567e5df