Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e796b7d34ddcee6…

MALICIOUS

PDF

85.8 KB Created: 2021-03-17 14:06:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d1c3b4a92f6513cf69cc04cb133be61a SHA-1: 6ee9d3dbca291b4d3a8278e2ac192ee70f37e400 SHA-256: 5e796b7d34ddcee64796b6624e825bea56614b2446dc4df6e4b7a87d9ab639e7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score suggest malicious activity, likely involving redirection to harmful content.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://vilenefex.ru/strik?utm_term=adobe+acrobat+pro+dc+how+to+use+objects PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420039/normal_604640ba9885b.pdfIn PDF document text
    • http://copytoshka.ru/winexuzejonasidnjes7.pdfIn PDF document text
    • https://furedanoduribi.weebly.com/uploads/1/3/4/6/134681858/1054699.pdfIn PDF document text
    • https://xanivumukil.weebly.com/uploads/1/3/1/8/131856382/5626599.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425005/normal_5fc8ab1928d0a.pdfIn PDF document text
    • https://cdn.sqhk.co/litawoxelida/gghaAnF/53959468393.pdfIn PDF document text
    • http://sujimelowakolop.medianewsonline.com/cfop_vs_beginners_method.pdfIn PDF document text
    • https://cdn.sqhk.co/purilusevike/MgiYgdp/lenitodefi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446762/normal_604d92dc593b5.pdfIn PDF document text
    • https://cdn.sqhk.co/rubuxupab/hjb1T4n/subway_surfers_rome_java_game_download.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/classical_fake_book_free_download.pdfIn PDF document text
    • http://naturfresh.space/76075943544q1ex5.pdfIn PDF document text
    • http://vexasefagi.scienceontheweb.net/is_the_secret_life_of_bees_movie_on_netflix.pdfIn PDF document text
    • https://vuduxedife.weebly.com/uploads/1/3/5/3/135337585/sisiwowuxixijefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419218/normal_5fd7dd1683805.pdfIn PDF document text
    • http://riwalimuj.scienceontheweb.net/97307274266.pdfIn PDF document text
    • http://flowerport.store/gejadatewaw692yk.pdfIn PDF document text
    • http://pugezesiw.mygamesonline.org/42532448943.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_6045ddb8a2a6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00011187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 5428 bytes
SHA-256: e069b30d9ecd32d2fb9a986b039aecc93a674e74fefde48d57539bb3a4f66b4d
font_01_sfnt_off00012406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12406 10980 bytes
SHA-256: f59ad3ea8589cde0b9fdc6047317734fa6e50d216f822ae49d96c9cb47d476af

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