Malicious PDF — malware analysis report

Static analysis result for SHA-256 154a71abfeaae937…

MALICIOUS

PDF

60.7 KB Created: 2021-01-04 01:07:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8ff268bfefc81dddfa5790819b786d72 SHA-1: bb0a5892657b318286df44afc51c8996a7b2fbcc SHA-256: 154a71abfeaae9377dac2f16dc22092bfac3c69ca9e7e1f1b68ea9a7ec33dea5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/aws?utm_term=square+numbers+worksheet+year+5 PDF link annotation
    • https://cdn.sqhk.co/nepasibuta/tje14pk/konasunebefewudunowib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475866/normal_5fc1030a7a92a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405903/normal_5fb6e6fa10376.pdfIn PDF document text
    • https://fezojeme.weebly.com/uploads/1/3/4/6/134614855/jojav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_5fd86544b0a7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bbce45f-85ff-47ff-94b3-57ffda79c2e6/72186589008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b1426ce-1a9c-4890-aa51-850b40111d8b/ensayo_de_comparacion_y_contraste.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2daffbf0-a364-4998-b264-9640afc14f5a/24945506810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98396533-2aeb-4f09-9491-6197dc63b42a/functions_modeling_change_5th_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc1d3136-b6ad-4690-a4b9-93742c93d162/nyc_doe_stars_classroom_legacy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78148703-5f73-4b43-b5cc-a0cc2d8c0ff2/nofemikujurufarumo.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_off0000b2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F5 5644 bytes
SHA-256: a3568e9101d61e5074a511616fcb01816d02daae3048bbe9a5b4a2bae8f64928
font_01_sfnt_off0000c61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61B 9492 bytes
SHA-256: 8e2b808d17d1f15b5deefa301ca6107242826e28480a4b1facacdc56f218f08e

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