Malicious PDF — malware analysis report

Static analysis result for SHA-256 050cc476ea1be16c…

MALICIOUS

PDF

75.0 KB Created: 2020-12-25 18:37:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2153cd757b435a793c0f2f0a7824bdd8 SHA-1: 77c99876a53c0884611ead0df281f3ce55af9d67 SHA-256: 050cc476ea1be16c29e4e67dbf52898051ea71400dfe8c420551e77e2d631812
156 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'Jimu robot building instructions' and embeds numerous external links, many of which point to PDF files hosted on file-sharing services. This behavior is indicative of a link farm or a phishing campaign aiming to redirect users to malicious content. The presence of multiple external URIs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=jimu+robot+building+instructions PDF link annotation
    • https://refapolujagosax.weebly.com/uploads/1/3/4/8/134896756/2431304.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/j19jUjh/takeout_restaurants_closest_to_me.pdfIn PDF document text
    • https://cdn.sqhk.co/fumazuri/cie04Vn/33972498944.pdfIn PDF document text
    • https://naxomusiji.weebly.com/uploads/1/3/1/6/131606859/9240222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427104/normal_5fa3f2c73aaab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375884/normal_5f8d25077cdbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_5f973c6d68f5f.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/85b25c93-0a31-4378-b1ae-58945b4b8fab/toto_fill_valve_keeps_running.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca408e7c-452b-4023-8497-e8024d16d53c/sony_vegas_11_authentication_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc25de2c-0ab1-4e74-82f5-05d7df554919/exercicios_sobre_relevo_submarino_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5c400e-e022-42a4-b202-3e1564b5d82b/81055333710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f6c90c1-1d92-4e5a-897a-2a40ac78422e/80252795989.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8fa4b46-9b93-45f2-ae7a-1a49f6534edc/domibamapakelap.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_off0000e738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE738 5180 bytes
SHA-256: 3fa867de71837852cf18df804cafc97318ebdf8c28142b4461ae8f2ca49ae57a
font_01_sfnt_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 11320 bytes
SHA-256: 4a72bcd92e34cccb41cbb4ff8e9212a7f9ce319439f6769e7163ef6247e87e48

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