Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b508a02f043577…

MALICIOUS

PDF

75.5 KB Created: 2021-01-18 15:44:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 29e1486a5a4e3b8b8dfb5002b05c9626 SHA-1: c7334e96dd5b2737a454feff3cc85dc4d1c1b5a8 SHA-256: e8b508a02f04357799df3688d41e72c9a3169b2dc6bf05960c620ffdf5cb8a3c
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains multiple embedded links pointing to known malicious redirector infrastructure, such as 'https://cctraff.ru/123?utm_term=western+guide+to+feng+shui'. The heuristics indicate that this PDF is designed as a link farm hosted on disposable infrastructure, aiming to redirect users to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/123?utm_term=western+guide+to+feng+shui In PDF document text
    • https://cdn.sqhk.co/nowovadizeb/cfhbN3m/forest_bubble_shooter_review.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/30EFTAf/71312405438.pdfIn PDF document text
    • https://loropigofog.weebly.com/uploads/1/3/4/5/134595907/ledij-kameburelujiwiv-xotofizibo-bujaxezijuj.pdfIn PDF document text
    • https://zokevuwokonumez.weebly.com/uploads/1/3/4/6/134682223/tepurefuzume.pdfIn PDF document text
    • https://site-1166704.mozfiles.com/files/1166704/spiral_wound_gasket_types.pdfIn PDF document text
    • https://site-1177333.mozfiles.com/files/1177333/red_blue_and_yellow_flag_with_white_arrow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384029/normal_5fb8f0aa314d6.pdfIn PDF document text
    • https://site-1166704.mozfiles.com/files/1166704/felarilet.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/gedemeti_vemopu_nurowetovideler.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459922/normal_5fd8615a90915.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484156/normal_5fe4184ccf870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369168/normal_5fd9ca6587251.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491927/normal_5ffeff303219f.pdfIn PDF document text
    • https://cdn.sqhk.co/tufuboloruj/iiIXTgg/vovusibol.pdfIn PDF document text
    • https://site-1171771.mozfiles.com/files/1171771/81456203546.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
    • 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_off0000de1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1F 4820 bytes
SHA-256: 09d0e0dab5685e2512fa328509827704148b7ca3bc3a76185e67d676d4832f37
font_01_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 10772 bytes
SHA-256: de5a806d8466fa9b262b29c07a6abec24c3943ee254538df8c93d92143cc1ba5
font_02_sfnt_off00011353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11353 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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