Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2b5fab68eacbba…

MALICIOUS

PDF

73.3 KB Created: 2021-02-25 15:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 093ca39c312070e4b98fb4bea602d4ee SHA-1: d76ddbfffb66d4085ed0cc27050c4cba5949fa2a SHA-256: 4e2b5fab68eacbba83fc7da62dd6b97ae0c857ee8102ab70845435e51b3047bd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to PDFs, suggesting a link farm or redirection mechanism. The primary IOC, 'https://druttle.ru/strik?utm_term=why+is+my+pace+cable+box+blinking', is likely used to direct users to a phishing or malware distribution site.

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=why+is+my+pace+cable+box+blinking PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483589/normal_60372942968a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401703/normal_5fd38bcbd73af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450044/normal_6026679995553.pdfIn PDF document text
    • https://vukojudal.weebly.com/uploads/1/3/5/3/135317211/940335d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393190/normal_603682c5708b7.pdfIn PDF document text
    • https://cdn.sqhk.co/zalivelo/8gdjjgc/ferorewawu.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/547af1a9b2ed8b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zubata/free_template_powerpoint_canva.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/tugitigujolazu.pdfIn PDF document text
    • https://s3.amazonaws.com/kakef/consonant_blends_flashcards.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/kangaroo_maths_past_papers_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/reported_speech_examples_questions.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55E 5344 bytes
SHA-256: 09f596e3c18ae5447910aa9615a639a4bdd84e80b979d1985d30eb78319ce5fc
font_01_sfnt_off0000e764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE764 10144 bytes
SHA-256: e2b65c8aff612c92426209cdc4c3b418deba80ea906051fe974b00a50cc58810
font_02_sfnt_off00010a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A35 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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