Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ec9ccf375b3742…

MALICIOUS

PDF

86.7 KB Created: 2020-11-13 18:20:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54d28f60d53ee0d95b7d3f9f2fc2ee71 SHA-1: 764f0be7599255188025db9107bbbda6877e181e SHA-256: f4ec9ccf375b3742794e5891cf5cd918b10ff68cedc8f498e8a3929ba856f205
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 redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings and numerous URLs suggest a link-farming or redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/123?utm_term=elementos+de+comunicacion+oral
    • https://cdn-cms.f-static.net/uploads/4367617/normal_5fad8f884b19a.pdf
    • https://tojuxumisadef.weebly.com/uploads/1/3/4/7/134714483/tafosa_jojudunivojup.pdf
    • https://cdn-cms.f-static.net/uploads/4369768/normal_5fa6d19dc8e16.pdf
    • https://cdn-cms.f-static.net/uploads/4405195/normal_5f973a26e1228.pdf
    • https://wefejakero.weebly.com/uploads/1/3/0/8/130814310/nexeravuj.pdf
    • https://cdn-cms.f-static.net/uploads/4427504/normal_5fa56e8e41a53.pdf
    • https://sefufomoxuve.weebly.com/uploads/1/3/4/5/134528328/907e9d17.pdf
    • https://fofafobef.weebly.com/uploads/1/3/4/3/134349457/40bc12528c5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/f5d96dd7-2ed6-4492-b5dd-96375c059089/zonim.pdf
    • https://uploads.strikinglycdn.com/files/50c8cd05-e7eb-4634-a89a-49b2d91c3157/94970386627.pdf
    • https://uploads.strikinglycdn.com/files/3307bb63-6ee8-4df3-ae75-436565d2c46e/lisirezanujuvibaj.pdf
    • https://uploads.strikinglycdn.com/files/a815ae5e-1264-403b-bb66-0f61cba14d55/my_dog_is_limping_front_leg.pdf
    • https://uploads.strikinglycdn.com/files/598e8c58-5982-43c8-bbc7-e8b7e7432ee3/fba_solo_and_ensemble_list.pdf
    • https://uploads.strikinglycdn.com/files/bed8b537-0ae8-4397-be01-c9effba8f1c4/gikijomotili.pdf
    • https://uploads.strikinglycdn.com/files/6e779502-be08-419a-92c8-6f9ae4007041/97958663863.pdf
    • https://s3.amazonaws.com/sedimeraxufi/29111373346.pdf
    • https://s3.amazonaws.com/mexijegedakol/estaciones_del_ano_2020.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010829.bin
580b4a3203bd7707c979902fac7dc3e5f7a0d94e1efc2cabd089b1c9bd5d159e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10829 4924 bytes
font_01_sfnt_off000118c8.bin
b8b4d133c1aa23fe19de19ab4d569d7bfa54ad7d7a74d321d3033079f9168c8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118C8 11636 bytes
font_02_sfnt_off00013e3e.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3E 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.