Malicious PDF — malware analysis report

Static analysis result for SHA-256 4616f5ba38b6cd3b…

MALICIOUS

PDF

75.2 KB Created: 2021-06-04 19:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a1ae95102f7e9e21bf7779b128726b78 SHA-1: 9024c8f4600dde78fe7ce0576fdf28c80054701f SHA-256: 4616f5ba38b6cd3be9284c94dfb1bf36f965fe70c60d21b1235d396dfaa48bee
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nomylo.ru/pbw?utm_term=how+to+apply+for+quarantine+exemption+malaysia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485016/normal_600b7b8b80887.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474231/normal_603bb1a7a532a.pdfIn PDF document text
    • https://wojawuminusevob.weebly.com/uploads/1/3/4/6/134694879/f092e486e1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448346/normal_5ff80b67aac96.pdfIn PDF document text
    • https://bigifami.weebly.com/uploads/1/3/1/4/131407708/midud.pdfIn PDF document text
    • https://gewasulupav.weebly.com/uploads/1/3/0/7/130740056/8392901.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482631/normal_606972552d49c.pdfIn PDF document text
    • https://puluduzi.weebly.com/uploads/1/3/1/4/131453343/fumalo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378843/normal_604f52135e7e5.pdfIn PDF document text
    • https://ximofutaxa.weebly.com/uploads/1/3/4/6/134626718/89b9c1d4.pdfIn PDF document text
    • https://raxuzorozejataw.weebly.com/uploads/1/3/4/0/134042373/zuwelolef-diramafuje-jakidixi-vujajew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413375/normal_6011b3af291c5.pdfIn PDF document text
    • https://powagexufofuw.weebly.com/uploads/1/3/4/7/134748875/binis-wivapeduba-tepakepuzilez-refegamevaromo.pdfIn PDF document text
    • https://nakubiwakuja.weebly.com/uploads/1/3/7/5/137511820/bibizurij.pdfIn PDF document text
    • https://vebudizegegogog.weebly.com/uploads/1/3/1/3/131398423/7407269.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/de1222e4-1df5-412e-9798-0eb355176bd4/will_there_be_a_lot_of_stars_out_tonight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6949eb2-799f-4562-bbe5-62a59d0638cc/lulogoxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48926a85-3064-4ac5-96aa-180e1c909da7/basutofisaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e8c1f9-b4d3-46aa-9588-18d23bcc5acc/what_is_reconstructionism_in_curriculum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dd7c21d-b4a2-4a5f-94d5-0f81918280ae/wimagol.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_off0000e77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 5396 bytes
SHA-256: db1ec4f24335c917214e878762d498dab2a20f59599127fed72bf2a0024af4f5
font_01_sfnt_off0000f9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E6 10916 bytes
SHA-256: ada013b2ed8d1cd9a3b6fae2973c9005d11fc3677b04681001da310c4657ecd4