Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f8ba484289bb4f…

MALICIOUS

PDF

73.2 KB Created: 2020-11-23 16:56:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f7f8536a914da40300f99fe0275ca791 SHA-1: b8c922d9a1906a6f01af74faed0a6992f5a70300 SHA-256: e1f8ba484289bb4f3ea2b5ec4601a01d92343ec7b905396ebfbd3f3515fe8ab6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a PDF link farm heuristic, along with numerous external URLs, suggests a phishing or SEO manipulation tactic. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

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://traffking.ru/123?utm_term=maverick+et-733+redi-check+review PDF link annotation
    • https://sebonegipuwi.weebly.com/uploads/1/3/4/1/134108682/3937009.pdfIn PDF document text
    • https://sojoxatufuwi.weebly.com/uploads/1/3/4/7/134710771/sepowudonuke-rilazopuresap-xadabawe-surobulig.pdfIn PDF document text
    • https://fupexojor.weebly.com/uploads/1/3/4/0/134017307/ziwijubi-vuferoda.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/fizaxo/all_information_about_indian_national_flag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc588a0a-1caf-4f2f-93d9-d831a91db779/what_is_after_a_billion_dollars.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/mumawejiduxegesuvi.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/68827905714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eebfc63f-30c5-4f7c-8859-3098559bb57e/pegodatinivamoputujux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e377f451-8d8a-4ab7-921a-d3143a0e03d3/bavimenuruvujevepat.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/mla_citation_worksheet_practice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b50914b6-66b7-444f-b15b-385b509dfdfc/romanian_last_names_and_meanings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dfa3c15-778a-4812-ac7d-b3d421dfc578/descargar_audacity_full_espaol_mega.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD764 5312 bytes
SHA-256: 2e74caf8f1e245753ea448c9ea42d0263b8e838c6dd63d585298044f6cd94878
font_01_sfnt_off0000e99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99D 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 11132 bytes
SHA-256: 6b9185ed99cf192cd5c0899d40d7656d014fcc555d9a87281cbb61e94f24c891

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