Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ab46a8116e74e2…

MALICIOUS

PDF

69.7 KB Created: 2020-11-25 03:12:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 103b0384913281f46e3df8f9f355bcac SHA-1: b74c1ba65d4b839e6b5ce75f8d8c17d59be3424a SHA-256: f1ab46a8116e74e24044982b69722212191d08d8141f336f0a0d41191cbc4b17
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristic findings reveal a significant number of embedded external links, characteristic of SEO farms or phishing lures. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

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://trafficel.ru/aws?utm_term=apache+poi+read+excel+multiple+sheets PDF link annotation
    • https://mesenogixu.weebly.com/uploads/1/3/4/7/134736765/2587756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388825/normal_5fa88599702e2.pdfIn PDF document text
    • https://sejubapis.weebly.com/uploads/1/3/4/8/134887951/abfb06d410b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369762/normal_5f8dee6bd15ef.pdfIn PDF document text
    • https://dapujevubo.weebly.com/uploads/1/3/1/4/131438680/tanazazuvaxabi-limitiwu-dakezafiso-lozupusolinig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383450/normal_5f938e8fc30e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426062/normal_5f9fc6c9c3b83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_5f9ecbb351798.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/gonafoziguwewe/jimananunasalebiroku.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/diagram_of_bacterial_transformation.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/acto_de_contricion.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/arabic_fonts_for_windows_10.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_off0000c432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC432 5372 bytes
SHA-256: 839b1ea87d58484bc664ee0fead966733b9f39a3f37fb0da2d2b7c109e2f99ba
font_01_sfnt_off0000d644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD644 5004 bytes
SHA-256: 97403b007a0f8d1e403dd07f521b28ebfe908ecf6c29e204e66f37eff032aaae
font_02_sfnt_off0000e4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B3 10784 bytes
SHA-256: daaf5aa4638db4df44a4bc75123c5288c07601e5fadca5db037ccc41b32c1ba8

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