Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc8f0aac38c3755…

MALICIOUS

PDF

66.9 KB Created: 2020-12-24 00:23:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a3c6c588648072a5b466a370d4c2c50e SHA-1: 65c8557391df04daf02502370af90f8cb37d87df SHA-256: 3cc8f0aac38c3755d15715115cbb497ead2cde630ec9e5d3868febcf0c3fa71d
214 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirectors and a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to immigration forms, aiming to trick the user into clicking the malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/aws?utm_term=cayman+islands+immigration+work+permit+form In PDF document text
    • https://cdn.sqhk.co/zuvutose/6hhx0Na/vogiduselinutiwiwamaxew.pdfIn PDF document text
    • https://badoguwogodunej.weebly.com/uploads/1/3/4/7/134713378/sivezapifu_teduwobepadagaw_risupotaw.pdfIn PDF document text
    • https://cdn.sqhk.co/pibigovaxavu/hiZhgic/mp3_player_online_website.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481667/normal_5fc7b99ab0b99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426675/normal_5fbf85e5c2553.pdfIn PDF document text
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/pufesip.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/3cfdcce1-af40-4443-9fa8-22221136f808/bapexipejolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4766f2a-7ac1-4317-b796-0c15d3461694/descargar_calendario_sep_2019_a_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44455a26-8ade-40d6-9743-b27d07fb002b/wozus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc8649ef-6e6f-430d-8cbd-54e558b4007c/units_for_hire_calne.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/063f9695-68cd-44b5-b72b-3ade1efe6669/pitodikubumonerar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07de6107-6abc-41a1-9dac-ae16a1ad6f2e/gizisobobozopaf.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_off0000c78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78C 5524 bytes
SHA-256: 0969e0e0bf2ecd2cd3ca2ba3653ae8b2b6d6c9c492ce07a436217f1f6494f7fc
font_01_sfnt_off0000da59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA59 10800 bytes
SHA-256: 22055b5163d2ae8b9dd2daf0a4ee671325b3d0842ca05b76be336394bec1bfba

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