Malicious PDF — malware analysis report

Static analysis result for SHA-256 554d6340fefd49ef…

MALICIOUS

PDF

87.9 KB Created: 2021-05-08 14:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 740d354a6d93e42bbc4e2f053b17abd4 SHA-1: 727ac5d28f5ceabdb2c9da3f48809cb751cecf83 SHA-256: 554d6340fefd49effeebe95fbd154188f525e5141f3be902f3560bff0f8779ec
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to SEO redirectors and potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. The embedded URLs and the structure of the PDF point towards an attempt to drive traffic to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://mezovuduw.ru/strik?utm_term=the+fruit+of+the+poisonous+tree+doctrine+definition PDF link annotation
    • https://sevujixosatanin.weebly.com/uploads/1/3/5/3/135316334/sezujitifu.pdfIn PDF document text
    • https://zufikuwokuz.weebly.com/uploads/1/3/4/5/134522796/lifoxis_vonunefo.pdfIn PDF document text
    • https://lerugusenexeke.weebly.com/uploads/1/3/5/3/135317851/notidodaresogo_wabexafoxuxi.pdfIn PDF document text
    • https://sadebisoj.weebly.com/uploads/1/3/2/3/132302749/bezidupamorawoz_delapunafa_negamevorogobit_wamoxej.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/065c8dda-e851-4943-b3e3-94eb7104efba/53727690633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88ac68e2-3231-49fa-80f5-f96ade9be143/jubatifufebakuzasu.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/20069504718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd14b7e3-1714-4985-8006-1521815137af/59264077137.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb894fc3-dc94-4427-95b4-070ca7fae404/is_mediterranean_food_keto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb1f4196-0f59-429d-8f64-349cab0eedc9/yard_machines_20_lawn_mower_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9edd4cb-19e8-48a3-bdca-da53e00aefb6/87855661114.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/do_sweet_potatoes_have_high_potassium.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/45643205534.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/887760c9-0953-483c-b5a0-5334965adb9a/audacity_para_mac_10.6.8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90987c57-60a2-4082-bb7b-e23a8595bc4f/oracle_sql_date_format_yyyymmdd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ebf6f9f-3ade-434b-8cfe-5f4b3dcf3645/free_english_grammar_book_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2102119f-5bee-423c-9afb-16190da3bac7/infinix_note_9_price_in_ghana.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c00ad07e-c01b-42f9-8b69-97e38992b0c0/xufatesutij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10eda5c7-a69f-4ac3-8c23-70c0db66ac4e/58446461061.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/89982340938.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/95170346786.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_off00011bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAE 4948 bytes
SHA-256: a909e4a88908fd6bdd3053dd4ef74a622406d206c6e31e32d8d84170f86eed72
font_01_sfnt_off00012c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C85 11212 bytes
SHA-256: 9fbfd22618b9d55f57f2cab33444cbfbe1a113e3ccb649f2812e162bf876996a