Malicious PDF — malware analysis report

Static analysis result for SHA-256 875942c9093a058b…

MALICIOUS

PDF

73.0 KB Created: 2021-02-18 20:32:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d952e7172ed3384f08736adaf864affa SHA-1: b7dcf000d296b9385081ded638afe8c66bcb149f SHA-256: 875942c9093a058b9f71ca516f0bcdbc7454c91e2eea8f6dc6f145e1ef0542c6
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting and known malicious redirectors, indicating a phishing or malware distribution scheme. Heuristics confirm the presence of malicious redirector links and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for credential harvesting or second-stage payload delivery.

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://yafferge.ru/wix?keyword=trane+z-wave+thermostat+%2528tzemt400ab32maa%2529+manual In PDF document text
    • https://porujeworor.weebly.com/uploads/1/3/2/8/132814718/femanuxadewujap-ledorube-zunovo-fasijusafub.pdfIn PDF document text
    • http://twirlini.com/vefifekamepasegem39zcv.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/fmhfggR/cu_boulder_environmental_studies_internships.pdfIn PDF document text
    • http://kersita.space/tatalusevivilegufft7pk.pdfIn PDF document text
    • http://blankid.ru/51680992369xrc14.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxozowaki/aihYZhb/v_moda_crossfade_wireless_manual.pdfIn PDF document text
    • https://pirizujimo.weebly.com/uploads/1/3/4/4/134454944/sagubadinog.pdfIn PDF document text
    • http://life50it.pro/kopujirenisubigururabiso3802y.pdfIn PDF document text
    • https://lexezidelaxo.weebly.com/uploads/1/3/4/6/134605078/saralitoma.pdfIn PDF document text
    • https://kobetuditi.weebly.com/uploads/1/3/4/4/134446504/7043117.pdfIn PDF document text
    • http://passive-income.ru/liwidovumifm8f9.pdfIn PDF document text
    • http://lessonsonline.site/buitoni_ravioli_nutrition_informationjgbpn.pdfIn PDF document text
    • http://counterman.ru/logo_liverpool_dls_2017aanxr.pdfIn PDF document text
    • http://ecoservice-vlad.ru/trumpet_fanfare_sheet_musichivua.pdfIn PDF document text
    • http://evilcheats.fun/aditya_hrudayam_by_spb_mp3_free_download6rjcy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn 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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3B 5928 bytes
SHA-256: fe5354b8d089b5ef88f03b4982d3acd7bc99b4b43c2412ba00b509a062009e23
font_01_sfnt_off0000e36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36F 6124 bytes
SHA-256: 406d9c14f76b4e0c27267bc63fa971fc1ebe99cb7b762b0c35436d2afb2f8dd6
font_02_sfnt_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 10280 bytes
SHA-256: f66a8dbf13f2a092bb4c552f28f50e2760954a8ffaeca418b495be8743181733

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