Malicious PDF — malware analysis report

Static analysis result for SHA-256 f603bcbe14c7f8dd…

MALICIOUS

PDF

73.8 KB Created: 2021-02-15 16:50:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b068dcb6edaaa1cb4b7eb0097b94dfa2 SHA-1: 807cabd1ee6204e3509d434d2b65ebf52c17be76 SHA-256: f603bcbe14c7f8dd48b605de84e17a5ae8da9939232277b40d38690dd7863d77
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=reason+to+believe+means In PDF document text
    • https://cdn.sqhk.co/pafatewodoju/RxR0heC/neighbors_game_2.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/1yjfj3L/71560215298.pdfIn PDF document text
    • https://wofovado.weebly.com/uploads/1/3/1/8/131871653/4243899.pdfIn PDF document text
    • http://xamejaduxak.22web.org/chicago_manual_of_style_17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412413/normal_6025291ee9ce1.pdfIn PDF document text
    • https://vijunefuk.weebly.com/uploads/1/3/4/5/134588972/3383859.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488141/normal_5ffa6b5a1d3f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_602263d8705a7.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/hNkjdge/12073382296.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/jha8zS1/blackboard_account_locked.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/oiNc5hf/91470311882.pdfIn PDF document text
    • https://zoladawa.weebly.com/uploads/1/3/4/1/134108991/gepeferudorufov_zaziwemovaw.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/78zyhfP/56747076521.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mipivazub.epizy.com/sheet_metal_cutter_for_drill.pdfIn PDF document text
    • http://bosurigazo.epizy.com/vebof.pdfIn PDF document text
    • http://xamukuxoze.epizy.com/veuve_clicquot_yellow_label_tech_sheet.pdfIn PDF document text
    • http://lotawovuvowuk.rf.gd/aashiqui_songs_1990.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_off0000e5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 4944 bytes
SHA-256: e763f635a8b5f5b30964f7b1455d66a607ab7e75d622c34a6d974063991303d5
font_01_sfnt_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 10564 bytes
SHA-256: e9932899098a4cfaf58cd85cafc21c27a8919c4c21dc7c252ac627977a901aa7

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