Malicious PDF — malware analysis report

Static analysis result for SHA-256 166a8aaa59299537…

MALICIOUS

PDF

66.6 KB Created: 2020-12-15 22:55:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 61b2c45bd21bd2ca89a3baa8a7c46d96 SHA-1: 961a4bfb7415c84fe2c6c8bdfbfd0f77f7bbc5ea SHA-256: 166a8aaa59299537fbc6abdb553863c29633b461b83e34d6fcbbd3e79cc03776
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest the document is designed to lure users to external sites, which could be for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ggtraff.ru/123?utm_term=google+sheets+filter+function+descending+order In PDF document text
    • https://pimakiwukusa.weebly.com/uploads/1/3/4/7/134712386/986ae6838b376.pdfIn PDF document text
    • https://sabijodamibig.weebly.com/uploads/1/3/0/7/130775907/nokigefinitid-jenazetotujar.pdfIn PDF document text
    • https://tariroviwobin.weebly.com/uploads/1/3/4/7/134715354/rarunuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376612/normal_5f9b3ce9694b7.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/68131b19-09f5-495d-8831-87975a3936e9/crusader_kings_2_forum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/869d1b4d-2eb6-4977-8246-26baae7a1e4d/87761915077.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/fitaronefikekojete.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/suxobexusuzubamotuta.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/funny_maths_questions_and_answers_in_malayalam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/615352d9-2ec2-4d02-8704-3e01095d7b8c/aloe_soup_conan_exiles_location.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/amoxicilina_suspensao_bula.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/taromurugakuxelud.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_off0000c877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC877 5104 bytes
SHA-256: 1e5ce0cf867320ee7dc53e0406749ae13976117041904423929f229767f998e4
font_01_sfnt_off0000d9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D8 10400 bytes
SHA-256: bc4f8815c6351a3f2aee0f491e7e000c2a59bd51bb2cd2d0719a2baa2d62121f

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