Malicious PDF — malware analysis report

Static analysis result for SHA-256 347a5ecdafebad32…

MALICIOUS

PDF

73.0 KB Created: 2021-02-24 20:45:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 52e5636af9e9809c114bf277eaa1c5a0 SHA-1: 2a876f5300e66bc6d8f5ccc10f74cffd67dadea0 SHA-256: 347a5ecdafebad321b2d9f040f1a38af68383660006686a418a45dd62a97853c
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 pointing to other PDFs, indicating a link farm designed to generate traffic or distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious campaign.

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
  • 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.
  • 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://druttle.ru/strik?utm_term=is+it+normal+to+not+be+able+to+see+a+heartbeat+at+6+weeks PDF link annotation
    • https://sojujigun.weebly.com/uploads/1/3/0/9/130969910/gopavezifoker.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412606/normal_602b49350be25.pdfIn PDF document text
    • https://puwoposujol.weebly.com/uploads/1/3/0/9/130969317/21e97cf461.pdfIn PDF document text
    • https://xijukuto.weebly.com/uploads/1/3/4/3/134354051/loxabe_xamapuno.pdfIn PDF document text
    • https://tivavazo.weebly.com/uploads/1/3/5/3/135337759/5795616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426269/normal_6017ab9b9a923.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408586/normal_6005cb2592d84.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/ridadirujaduz-zadawisude.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465263/normal_5fdc64d1d0f49.pdfIn PDF document text
    • https://vejelajaluseno.weebly.com/uploads/1/3/5/3/135392022/0236501.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410002/normal_600196728f4b0.pdfIn PDF document text
    • https://juduloto.weebly.com/uploads/1/3/5/3/135323899/7785003.pdfIn PDF document text
    • https://wevinavuligi.weebly.com/uploads/1/3/4/5/134505150/pinepevapalizi-suxugum-kariside.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445866/normal_5fed682e0f003.pdfIn PDF document text
    • https://ponawexem.weebly.com/uploads/1/3/2/7/132740185/joremagareli_vurewaxelep_musurixeri_rurureg.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/CCIjesm/76308496176.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/pizexopenaxu/computer_background_photo_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/articulate_noun_form.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/tikal_guatemala_travel_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/white_subway_tile_backsplash_sheets.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_off0000e0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A7 5312 bytes
SHA-256: e082fb0c22cce67349b4a3f9cde27201fabc9509956c265c691eb03cca002934
font_01_sfnt_off0000f298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 10500 bytes
SHA-256: 9be70e4262d22ce09e012316e5fb8db4e864b0354156492ba2bf58119ac048ec

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