Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a3113f7c24516fa…

MALICIOUS

PDF

69.0 KB Created: 2021-04-02 21:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: afb8a3580793e56a0ca18640d5bcb6cd SHA-1: 336d409d362f850536c8bec9a36e4137d58e620f SHA-256: 9a3113f7c24516fac369bff2a0e92acf57c1573cffab2bebad49548577c0cef2
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be a lure related to a search query, suggesting a phishing or scam attempt. The presence of multiple disposable hosting links further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=what+is+the+weight+of+diesel+fuel+per+gallon In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376126/normal_5fd9146147aee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505125/normal_602770fe3486d.pdfIn PDF document text
    • https://kafomepavazepa.weebly.com/uploads/1/3/1/4/131409794/5e906c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393016/normal_5fc8294d8e0c5.pdfIn PDF document text
    • https://popajilosofov.weebly.com/uploads/1/3/0/7/130776408/3c3ca050ef79173.pdfIn PDF document text
    • https://fufiwixafuwisu.weebly.com/uploads/1/3/4/7/134770326/74b7c70b8b.pdfIn PDF document text
    • https://kilizilefepik.weebly.com/uploads/1/3/0/7/130775254/wilive-sumetivixipex.pdfIn PDF document text
    • https://mudabomem.weebly.com/uploads/1/3/0/9/130969182/6817069.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444850/normal_603c8a1b73e38.pdfIn PDF document text
    • https://cdn.sqhk.co/zazavoxujub/hbNgegd/ios_core_graphics_draw_line.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/5Y8Zha7/clavinova_yamaha_electric_piano.pdfIn PDF document text
    • https://cdn.sqhk.co/lokijuzim/bhgm6ie/22785968692.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376375/normal_5fd2ec6ebfa35.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/rilexazejuzovep/lochinvar_solution_boiler_review.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/greenwell_point_bowling_club_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/27271789451.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/kaplan_new_sat_practice_test_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/how_dare_you_greta_meme_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/general_information_sheet_sec_stock_corporation_2016.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C3 5408 bytes
SHA-256: c1bff70222a59f5a2ffedabe1adec9b0d6a260c4202504ec991716ad8c89cecd
font_01_sfnt_off0000e440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE440 10008 bytes
SHA-256: 09a9ff35d29856e2be4cb5127b092748c7dd609602feaa2a72acc95eb4dd4d1f

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