Malicious PDF — malware analysis report

Static analysis result for SHA-256 97611fd20dab0cb4…

MALICIOUS

PDF

83.8 KB Created: 2021-03-09 11:22:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9dfc23062443f24aee0922d38da05552 SHA-1: fae17b16b969fb87e16b267d27daf239b522d4cc SHA-256: 97611fd20dab0cb4cd57ca86a1f43b221cf77b5647cd1ebe98dfb29d544796fc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO abuse tactic. ClamAV and ML classifiers identified this as a phishing or malicious PDF. The embedded URLs and the heuristic firings strongly suggest the document's purpose is to redirect users to potentially harmful content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jumiwimov.ru/aws?utm_term=what+is+the+difference+between+team+lead+and+supervisor PDF link annotation
    • http://nashremont.site/castbox_app_apkjqt5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486537/normal_5ff6b9858537a.pdfIn PDF document text
    • https://bajorenurelop.weebly.com/uploads/1/3/0/7/130739037/gekasunogorari_pegolofobis_kimiwe_vasejobagug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487626/normal_600fcafc47285.pdfIn PDF document text
    • https://ramemegu.weebly.com/uploads/1/3/1/3/131383760/a11d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475217/normal_5ff06c2eb1e57.pdfIn PDF document text
    • http://stakingyfi.com/bob_revolution_flex_jogging_stroller_car_seathuu8y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468836/normal_5fe834578956c.pdfIn PDF document text
    • https://niromegezos.weebly.com/uploads/1/3/2/6/132681660/7277585.pdfIn PDF document text
    • https://leresawukulet.weebly.com/uploads/1/3/1/3/131384076/pivozu-fusipe-liwip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492555/normal_5ffe63de52d7c.pdfIn PDF document text
    • http://kungfumalibu.com/el_caballero_dela_armadura_oxidada_resumen_corto_completoeh9w3.pdfIn PDF document text
    • http://mirror-x.org/directions_to_big_fish_grill_issaquahtok03.pdfIn PDF document text
    • https://sivubatololux.weebly.com/uploads/1/3/4/8/134850937/xojudama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393641/normal_5fd0d9a2423e2.pdfIn PDF document text
    • http://logmeinnow.xyz/retukovebisepcdxmp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_6046c015e1821.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c45eef82-3a34-4f46-ac40-7d1976f8e01a/30440032649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4718ee6f-afd3-4dd4-86d3-d28da9b34c9b/the_birchbark_house_chapter_10_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8d63d74-00bc-465b-8061-1c42f98bb3b2/unwind_neal_shusterman_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fa1a490-6552-42dd-b6d1-2b4f35f61618/51150422630.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e42058e-5049-43e9-ac4c-9c05f257547d/xupipivatopip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50c36781-d728-4e6e-8546-dc785f9530c9/perros_relacion_humanos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE18 2960 bytes
SHA-256: d8ef148c594adba1946aa7d95f188f3f33f69c77bc22762a1a4a57bcfd89a796
font_01_sfnt_off0001089a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089A 5700 bytes
SHA-256: 72c1e66a1ca5645e74145efce4157542765ec58533366395a01b284b839328eb
font_02_sfnt_off00011bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF6 10836 bytes
SHA-256: b019d5d14ad25f84c9fc98d9bf790f7b9a7130863bbb0ed8e019b0c424453ab9