Malicious PDF — malware analysis report

Static analysis result for SHA-256 702524f3c7a476f9…

MALICIOUS

PDF

84.4 KB Created: 2021-03-29 00:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cf43e8339a18c4b56ab9b10a6aa4e961 SHA-1: 410ffe160bed15e2406d9a5e3a3b4d49c62b7b0d SHA-256: 702524f3c7a476f9c945703378b87f53fa55f334224eae80215c3479a4c45e3b
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm, and one prominent link is identified as an image lure for free-download phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://kuzutuzo.ru/strik?utm_term=usps+supervisor+customer+service+job+description PDF link annotation
    • http://fofoketezifofi.22web.org/73887814629.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/jlgiOhg/bawiwoz.pdfIn PDF document text
    • http://toxedixekerej.22web.org/divergent_book_ar_test_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/iPD0kof/android_tv_remote_control_app_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/ggl2gdB/verizon_cloud_backup_text_messages_iphone.pdfIn PDF document text
    • http://vuxuvex.iblogger.org/antologia_de_cuentos_argentinos.pdfIn PDF document text
    • https://gosomojigu.weebly.com/uploads/1/3/1/4/131438658/foguwumametedesijina.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/eQicvhj/management_textbook_mcgraw_hill.pdfIn PDF document text
    • https://wijedokimevu.weebly.com/uploads/1/3/4/6/134649091/3227195.pdfIn PDF document text
    • https://wojumujar.weebly.com/uploads/1/3/5/3/135396772/sabudeputazi_jezeg_lezosafoze.pdfIn PDF document text
    • https://rudemituwidiv.weebly.com/uploads/1/3/4/5/134585289/kexusatis.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/44bf75f5-dbeb-4668-9201-c509715d70b7/59186051646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8033ec6d-3d28-4b11-af40-e69ec14b08f4/wolizumupupobufigabixoned.pdfIn PDF document text
    • http://wozurowimure.epizy.com/latex_beamer_include_file.pdfIn PDF document text
    • https://s3.amazonaws.com/podawakumepewez/82890482903.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/didriksons_hat_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/nugukovenipexedixez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd378e98-e6e9-4ab4-99c7-21c3acaef26a/movixodubigokaf.pdfIn PDF document text
    • http://gawekavadave.epizy.com/gapinibukukusuvujenaxul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdaa84db-2620-4384-b632-6780255d76c8/how_to_write_five_hundred_million_one_hundred_fifteen_in_standard_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e294af5-bd86-4b92-a919-49217ad6db43/amar_o_depender_de_walter_riso.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/serie_carcereiros_mega.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/what_is_the_dependency_theory_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/calcific_tendonitis_shoulder_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/detevogabojunaku.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/92459735800.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_off00010e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E69 5244 bytes
SHA-256: dab05b52fec31faef17be876aee90f243b2d141e3406be27def5715b4a0060c3
font_01_sfnt_off00012035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12035 10264 bytes
SHA-256: 733082fb7f56dbcb4f7e57e232576bf9bd0087354fd5e748b3a03ee29a1bd721