Malicious PDF — malware analysis report

Static analysis result for SHA-256 adad3d0cf1e073df…

MALICIOUS

PDF

76.5 KB Created: 2020-11-25 06:32:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f7713f9cc341ad61e52ec39f22cbd139 SHA-1: 1d453ea80243ad413b18bb83bad830568ee42243 SHA-256: adad3d0cf1e073df0971998c1950a286b0e403c11f700142e319d2985161d512
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, characteristic of a link farm designed to drive traffic to various websites. One of the URLs, https://cctraff.ru/strik?utm_term=heathcliff+wuthering+heights+black, is identified as a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this document.

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://cctraff.ru/strik?utm_term=heathcliff+wuthering+heights+black In PDF document text
    • https://bitifuzafaf.weebly.com/uploads/1/3/4/4/134488734/c482f8a.pdfIn PDF document text
    • https://tupokigefadewun.weebly.com/uploads/1/3/4/7/134702618/rivuzexatajil_fuxapixud.pdfIn PDF document text
    • https://dozefiduvema.weebly.com/uploads/1/3/4/6/134617149/426ccc923e64818.pdfIn PDF document text
    • https://nakumupapetiz.weebly.com/uploads/1/3/2/7/132741615/gefikotufajisajim.pdfIn PDF document text
    • https://pefekebemapufug.weebly.com/uploads/1/3/4/3/134370705/fulixinuremetobolo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472216/normal_5fa6264247d52.pdfIn PDF document text
    • https://kejijasorakabil.weebly.com/uploads/1/3/4/3/134311956/serisabepi.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/da1c46cb5.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/nepawigexa/discord_id_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c1bcfac-79d5-4988-baca-d391dcea7363/eths_online_tools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f06af01-f9e4-427a-849e-f0d7c17107e2/butternut_candy_bar_recipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/843845a6-e12a-49f0-9b9e-40439126b85f/jofotogovenevuwadezanexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a14d6069-b8ec-4fa2-9afd-b9b106421345/biographical_thesis_statement_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d68390f-efcc-401e-adb2-7cc772ce40f9/75356264458.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_off0000eee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE5 5400 bytes
SHA-256: 3b5eba33b18b20166ad7fff53a6ddb02bde2374eaa73c45e8e78a685a3706f1d
font_01_sfnt_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 10680 bytes
SHA-256: 2b4a9706fc900a732124dae0f249d68dabe845c8c93e01f99ba1b264ab4c7a26

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