Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a5608f413ee20b…

MALICIOUS

PDF

72.5 KB Created: 2021-02-17 22:53:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 73f22f372440b36fb8148f43c15693a7 SHA-1: a111213fa33e9ab33c9f017aaff1d1d0b12e2871 SHA-256: 74a5608f413ee20ba76d791051b4a149087a13a6951ce66e814f0331298187f8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The file's structure and numerous links suggest it functions as a link farm to distribute traffic to various potentially malicious sites.

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://crophysi.ru/strik?utm_term=narrative+essay+outline+college In PDF document text
    • https://cdn.sqhk.co/tosobulig/Xgjjhds/47537967792.pdfIn PDF document text
    • https://kapegidaboxisi.weebly.com/uploads/1/3/4/5/134527108/laxogifisina.pdfIn PDF document text
    • http://henrysavbr.site/18810757514lzkmb.pdfIn PDF document text
    • https://bipokedofep.weebly.com/uploads/1/3/5/3/135322207/tasitorogi_futopusasodekuw.pdfIn PDF document text
    • https://detabifaf.weebly.com/uploads/1/3/1/4/131436978/5e415351b.pdfIn PDF document text
    • http://stixlife.info/jatodinikoeqc.pdfIn PDF document text
    • http://fallofelin.online/23210077670hbpt9.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/dDjfsZs/guviral.pdfIn PDF document text
    • https://dulewexafup.weebly.com/uploads/1/3/4/7/134702005/zorona.pdfIn PDF document text
    • https://dezilitew.weebly.com/uploads/1/3/4/7/134728488/tidunafisilud.pdfIn PDF document text
    • http://pop-marketplace.ru/571669700793ucci.pdfIn PDF document text
    • http://hallop.xyz/3d_printing_files_formatzcxty.pdfIn PDF document text
    • https://cdn.sqhk.co/tejusukaxajo/8vuCggn/new_gangster_crime_mod_apk_download_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/vifamepupib/jEYgegh/legends_pinball_price.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/gjdxjd2/fast_lane_rc_drift_cars.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gebogozomusedom.rf.gd/vewadugufegatememon.pdfIn PDF document text
    • http://rorulapuvutoj.epizy.com/how_to_use_the_foodsaver_vacuum_sealing_system.pdfIn PDF document text
    • http://zivumimilalak.rf.gd/soul_knight_alchemist_guide.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_off0000e066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE066 5100 bytes
SHA-256: 99c09280a16c872e9a6cd0edd0ce200230cc9a285c5e42338c72cf1745f91b86
font_01_sfnt_off0000f1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E7 10212 bytes
SHA-256: e847bc383c1ee47085e6983d2e2b39ac590f6309ed1cea03b5e2749db453dae2

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