Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d50d9e2c6355eb3…

MALICIOUS

PDF

67.7 KB Created: 2021-03-24 21:02:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12878367a09e38a47a4443ebeb2ddd8e SHA-1: e4b8f12f25452156169dfb3481222b12b1595b64 SHA-256: 4d50d9e2c6355eb3a07eb70720d7b6879ff9567b45cb8680743c517356c14b18
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to unrelated PDF documents, indicating a link farm for SEO manipulation or phishing. The primary malicious URL identified is https://dafemum.ru/strik, which is likely used to host or redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://dafemum.ru/strik?utm_term=setina+seat+installation+instructions
    • https://cdn-cms.f-static.net/uploads/4487623/normal_600e03ee69c73.pdf
    • http://sisogelodaze.medianewsonline.com/medical_dictionary_english_spanish.pdf
    • https://static.s123-cdn-static.com/uploads/4531523/normal_60052d1cba5ac.pdf
    • https://xazezegusi.weebly.com/uploads/1/3/4/5/134505133/nidutipelumerer-rezamimarexozad-wenezipobor-domowujuwexa.pdf
    • https://kitivagep.weebly.com/uploads/1/3/0/7/130775950/bivizesupovosadis.pdf
    • https://static.s123-cdn-static.com/uploads/4446502/normal_5fdf48b4df42b.pdf
    • https://fabodafulunulof.weebly.com/uploads/1/3/4/3/134372089/20885.pdf
    • https://povebosi.weebly.com/uploads/1/3/5/3/135346093/mopelamosumofego.pdf
    • http://dapajurop.mygamesonline.org/60412167404.pdf
    • https://fafafavavilaba.weebly.com/uploads/1/3/4/8/134893162/loxelak-rosonixirewe.pdf
    • https://meboguvogo.weebly.com/uploads/1/3/1/4/131437667/gapojuvovofiw.pdf
    • https://cdn-cms.f-static.net/uploads/4464055/normal_602aad10a43f5.pdf
    • http://fakaluwu.scienceontheweb.net/41968171898.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f8796b5b-1e4a-40c3-a79e-51ddffa3427b/92105539139.pdf
    • http://gepivefukusi.atwebpages.com/arsenik_zehirlenmesi.pdf
    • https://uploads.strikinglycdn.com/files/ab5264e6-8915-4889-a693-8e6c262a7cff/what_is_the_feminist_approach_in_sociology.pdf
    • https://uploads.strikinglycdn.com/files/a042cd8e-59b8-4fc1-9598-cdbd99de4fc6/62932557741.pdf
    • https://uploads.strikinglycdn.com/files/c094c8b0-42c3-43af-8972-51a5ab1aa63c/derechos_humanos_en_mxico.pdf
    • http://neketepa.myartsonline.com/free_toefl_reading_passages.pdf
    • http://kitilogokufalu.atwebpages.com/sozufawu.pdf
    • https://uploads.strikinglycdn.com/files/24722fb9-1578-4c9f-836d-bb28f55067c1/quien_es_el_esposo_de_eva_luna_montaner.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd8b.bin
6f02b00773f6b43ab7e47c86920302644580851214ccd81d9eb5416a1f84810f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8B 4896 bytes
font_01_sfnt_off0000de39.bin
1250e08a35170d68d683b368b8d170151c3e1f59cb07b618cf4866f8028b3314		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 10424 bytes

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