Malicious PDF — malware analysis report

Static analysis result for SHA-256 69aa2bca35c5150f…

MALICIOUS

PDF

70.4 KB Created: 2021-01-18 22:28:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e061966efa7f4f3285150b37cbffc1cf SHA-1: 133d33c35f944eeb3e0010e76629a8b715ebd69f SHA-256: 69aa2bca35c5150f51a2cf354831dd0349da0b91ebf77d40019065d35c3fa03c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF that leverages SEO poisoning to lure victims with a seemingly relevant document title. It contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a phishing or malware payload.

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://ggtraff.ru/123?utm_term=ford+6f35+transmission+repair+manual+pdf In PDF document text
    • https://cdn.sqhk.co/zijikunu/gir7Ghh/28600273752.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/hgib1DH/anger_of_stick_4_apk_offline_mod.pdfIn PDF document text
    • https://site-1246576.mozfiles.com/files/1246576/migepejabigikelera.pdfIn PDF document text
    • https://site-1247015.mozfiles.com/files/1247015/25506302538.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/KieidIx/pba_bowling_challenge_dt.pdfIn PDF document text
    • https://cdn.sqhk.co/ladetozuxi/jhgidTK/world_at_arms_guide.pdfIn PDF document text
    • https://site-1178820.mozfiles.com/files/1178820/gizilukil.pdfIn PDF document text
    • https://cdn.sqhk.co/nawovoso/fjbkjDm/fozuzo.pdfIn PDF document text
    • https://site-1180889.mozfiles.com/files/1180889/best_free_dating_sites_in_usa_2018.pdfIn PDF document text
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/b3e0da172a537.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/towutoginadivu/feasibility_report_preparation_and_evaluation_criteria.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/zifudafujemipo.pdfIn PDF document text
    • http://tivogowajap.epizy.com/picsart_banner_background.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/77509546784.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/brooks_dunn_reboot.pdfIn PDF document text
    • http://gumigojozupe.epizy.com/free_old_newspaper_template_google_docs.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/tutorial_basico_de_excel_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/free_lds_sheet_music_violin.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_off0000d6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C3 5584 bytes
SHA-256: 3c2a958eb23cb34b63d4bfd45dd4a5d21e455e79d232710fdfce8a653740ab7a
font_01_sfnt_off0000e9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 10192 bytes
SHA-256: 0f57239c40d550da47fc7742a16af1fc26e77942e8ff8bf83e6241334c240609

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