Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41d7b2798f5ccd9…

MALICIOUS

PDF

65.1 KB Created: 2020-11-10 22:11:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 47fbbeaf3f525f90cca895489645eaf8 SHA-1: e8887a6eec81085d6e39241bea9e45482cb485df SHA-256: c41d7b2798f5ccd9dddd56a5e7e345a95c6b1f02be52e421ce4016c6ffebdd79
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or redirection mechanism. One of the primary URLs, 'https://trafficel.ru/strik?keyword=mongrels+edit+course+code+fortnite', appears to be a lure, potentially leading to a phishing page or malware download. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious intent, likely related to spearphishing.

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/strik?keyword=mongrels+edit+course+code+fortnite PDF link annotation
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/banagefasusum.pdfIn PDF document text
    • https://pitejuxupukure.weebly.com/uploads/1/3/4/5/134500798/4117739.pdfIn PDF document text
    • https://tubumafipe.weebly.com/uploads/1/3/4/4/134458357/pomogebiwu.pdfIn PDF document text
    • https://norumevi.weebly.com/uploads/1/3/0/9/130969469/vijemoki-mubofaxozip-mixilokuvuvaza.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/fasanag/fazeligukimegasepuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/english_english_malayalam_dictionary_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25f07e99-895e-4542-8d2d-65365ec78e89/end_of_the_year_math_projects_4th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/rule_of_law_definition_ap_government.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/91980419859.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/cuckoo_clock_weights_amazon.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/puvowapesedil.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_off0000c435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC435 4984 bytes
SHA-256: add982366eba83d1d51933fe8d49f72b34000e50a9035c01e2b0b14a2512d705
font_01_sfnt_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 10200 bytes
SHA-256: 36ff141c4031758248c348cdd6bf2d95acb0dd36748e834c006b89ec22addd1a

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