Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa276c05b9f8844c…

MALICIOUS

PDF

75.6 KB Created: 2021-02-03 13:21:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 44462b8d7d05e466c00c70219b4ed70d SHA-1: 8e09c9e4ef20c4790a986d357686f2cffe67c4f9 SHA-256: fa276c05b9f8844c97c1ec252b39ffa4040d57760357ff813276ef0274094f1b
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://crophysi.ru/123?utm_term=practical+ophthalmology+a+manual+for+beginning+residents In PDF document text
    • http://healthyforczechrepublic.site/kabevanikwylg.pdfIn PDF document text
    • http://teenagetutor.online/the_shoemaker_and_the_tea_partya9s2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413236/normal_600a216ad83db.pdfIn PDF document text
    • https://novomuzedideb.weebly.com/uploads/1/3/1/4/131406537/4424269.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450037/normal_5ffc1f6509a51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483833/normal_5fcbe68b9c20b.pdfIn PDF document text
    • https://cdn.sqhk.co/sejixikerut/WVqbKFw/madrid_zombi_personajes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462730/normal_600ad9dbd3d72.pdfIn PDF document text
    • http://boxberry-24.cc/movie_prime_cut_youtube4fgm3.pdfIn PDF document text
    • https://sozazajigosana.weebly.com/uploads/1/3/0/7/130739782/mulawuv.pdfIn PDF document text
    • http://jadebey-x.com/soal_deret_aritmatika_dan_geometrihojqq.pdfIn PDF document text
    • https://cdn.sqhk.co/jodariwem/ysjctpO/brand_management_definition_en_francais.pdfIn PDF document text
    • https://tagekoworiz.weebly.com/uploads/1/3/4/0/134016686/5387088.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/ijfgc5c/nomafodizado.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446511/normal_5fe4e1ea18750.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/liluvad/vertigo_1958_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/30647395209.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/glass_sheet_backsplash_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/video_online_copy_url.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/57148278143.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_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 5812 bytes
SHA-256: 57eb2aa84b6f2b1d8ef780736bf11797ce7db7112681dd90431eb4068b4be4c8
font_01_sfnt_off0000fb67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB67 10840 bytes
SHA-256: 3775bf6d95e230709fa8f8649f53b80066f7accf7c78cf56898ab7100b9ce18e

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