Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3299ff5ee9859d…

MALICIOUS

PDF

122.0 KB Created: 2021-04-08 01:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0902e1fe359e8044e3f292faef50559c SHA-1: ce3e11075671d944a9322a476c7ca7ca767982fa SHA-256: ca3299ff5ee9859d339eae6fcc0d708f633a518ba1d1e31eff7c0e298fc6d7f7
244 Risk Score
Tags
free-cdn-ebook-manual-lure

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, indicating a link farm or SEO spamming tactic. One critical heuristic identified a link to known malicious redirector infrastructure. ClamAV also detected this file as a phishing trojan, supporting the malicious classification. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=boruto+episode+63+english+sub+dailymotion In PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://info-pages.ru/jamumoveluviwabo8d65c.pdfIn PDF document text
    • http://copalofa.site/5462074849xckd3.pdfIn PDF document text
    • https://cdn.sqhk.co/rotonoba/1TihpOv/80739794362.pdfIn PDF document text
    • https://wotuterivakevom.weebly.com/uploads/1/3/4/6/134608936/3235707.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402478/normal_6039c3c156754.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474980/normal_60659eed7a399.pdfIn PDF document text
    • https://doselarifiniwa.weebly.com/uploads/1/3/2/8/132814949/c79f9ba.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/ngff5jf/video_player_for_pc_windows_10_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387218/normal_603e87f00d90f.pdfIn PDF document text
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/wivodomuku-nuliwezexiniw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425238/normal_6049756c78af4.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/5T1Tme5/sagomapazufuxiragorofa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/turtle_beach_ps3_headset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb97d702-a025-4302-8662-7539afcbfb04/dijufesigazazopuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/how_to_get_nike_to_donate_shoes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71096520-7688-4f7c-96c7-37f1496246f5/how_many_years_should_a_central_heating_boiler_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0f2a161-0b5b-4a93-804e-a227d33ba03a/activities_to_teach_english_speaking_skills.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/jusibuvazal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c656218f-f6e0-4c0d-9601-e7ce6d8b977b/72658821233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2db9953-7872-48eb-a6fe-e9e628b4328a/fisosepajuxafelasotativa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014d46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D46 19944 bytes
SHA-256: b51261b839184bedc45d173ea4d9a01f3f728d8658c4f19d8fc7a6f04e3c5b89
font_01_sfnt_off00018d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D7F 5864 bytes
SHA-256: fb8baacea25b119bfd711ce138bccd73a3244fff62ff0289db1fb0068fcc16a3
font_02_sfnt_off0001a144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A144 13276 bytes
SHA-256: b7853205f87bf10e32f736af332e7acf6f1ac482f599db5d8d36435e5a24179b
font_03_sfnt_off0001cc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC25 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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