Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cf7feaa5044065…

MALICIOUS

PDF

72.4 KB Created: 2020-11-10 02:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: f2f69781a05186ccf76f3266607c8ea9 SHA-1: 26f940c116c691f28daab415145245886125bd85 SHA-256: 77cf7feaa50440656ea1f9a9fb7a6be086b12e45065139f3b8cb95774a2306c4
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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?keyword=wpf+4.5+unleashed+pdf+github In PDF document text
    • https://fanawilixu.weebly.com/uploads/1/3/1/4/131408209/liloxu_tewogeti_gujerorubokimug_nekibunufigi.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/99359d9c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404308/normal_5fa1e22fec782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367313/normal_5f9521be0c715.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370764/normal_5f8952c1a1be4.pdfIn PDF document text
    • https://delidenaluno.weebly.com/uploads/1/3/4/4/134438050/ravanimite-wanuvin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462046/normal_5fa463f6c5396.pdfIn PDF document text
    • https://fubasuwa.weebly.com/uploads/1/3/4/6/134611144/7686262.pdfIn PDF document text
    • https://menelaxewo.weebly.com/uploads/1/3/4/3/134362368/linejuxowaxol-dazego.pdfIn PDF document text
    • https://xomevore.weebly.com/uploads/1/3/4/3/134346529/fukukarumaj-domajata-vaxenipisaju-gunamizorifig.pdfIn PDF document text
    • https://kivuligob.weebly.com/uploads/1/3/0/8/130874143/d7426a0f0c6072e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454547/normal_5fa9ca9e4b773.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/zetubakuz/flipped_full_movie_google_drive_english.pdfIn PDF document text
    • https://s3.amazonaws.com/zukukelejurotef/49866242199.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/92861016130.pdfIn PDF document text
    • https://s3.amazonaws.com/wajibile/watch_divergent_online_full.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_off0000cfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE7 5376 bytes
SHA-256: 85a50f1a01e3942324254a7e1c4b74469e99b0fd295007aee5b8beb9a67a6aaa
font_01_sfnt_off0000e23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23E 10536 bytes
SHA-256: 79e9ccf399a398d3a29d32771ff1010800b7f8811b43c347d263233661368c47
font_02_sfnt_off00010651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10651 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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