Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef744722166b68b…

MALICIOUS

PDF

78.6 KB Created: 2021-05-06 05:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3f34558e86a73f37f1203ff2d94e261a SHA-1: b4dc59e65994521b9becd61b7269ea2ef0664ad4 SHA-256: 8ef744722166b68b4f5e4de69fb8acb53eaab3611d0399e90c15a82add9bf020
136 Risk Score

Malware Insights

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

The PDF file contains a lure related to English verb tables, designed to appear as a free download. It utilizes a redirector URL, https://resalured.ru/strik?utm_term=tabla+verbos+regulares+e+irregulares+en+ingles+pdf, which is flagged as a high-risk indicator for phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://resalured.ru/strik?utm_term=tabla+verbos+regulares+e+irregulares+en+ingles+pdf PDF link annotation
    • http://ramerofebib.iblogger.org/calculator_app_source_code_android.pdfIn PDF document text
    • http://bebolekuku.22web.org/jubesun.pdfIn PDF document text
    • http://folubowavu.22web.org/84305063738.pdfIn PDF document text
    • http://dajazadek.22web.org/50211699064.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/14954347551.pdfIn PDF document text
    • http://vozuzutiwajuzip.getenjoyment.net/madjax_rear_seat_kit_club_car_precedent.pdfIn PDF document text
    • http://bukupiduge.mypressonline.com/pilanupew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_6d612e1c6d7340f4a38e80bd414254cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/polexebuj/nosazamodosamu.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/ncert_maths_textbook_for_class_6.pdfIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_35a04d13d6ae4c18af0eb11f775e6237.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxewiwupir/dagig.pdfIn PDF document text
    • http://zokaramizixa.atwebpages.com/android_mobile_codes.pdfIn PDF document text
    • http://tuvufuxo.epizy.com/how_to_reply_thank_you_email_for_job_offer.pdfIn PDF document text
    • http://forofadikov.rf.gd/infinera_coriant.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/beats_wireless_studio_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe1f6c1b-6fdb-4e8b-98aa-6f68decaca7b/how_to_pray_for_marriage_partner.pdfIn PDF document text
    • http://gozozofufeb.rf.gd/how_to_use_samsung_hmx-f90.pdfIn PDF document text
    • http://lojibovel.myartsonline.com/best_voice_reader_app_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/amoniaco_propiedades_fisicas_y_quimicas.pdfIn PDF document text
    • https://3d7c42e8-cad9-4196-8f3c-0f210fd97588.filesusr.com/ugd/1b7c00_8ed1ccc0d1a14d51822356531ac71461.pdf?index=trueIn PDF document text
    • http://rikovaniroxatox.rf.gd/how_much_does_a_beretta_92fs_weight.pdfIn PDF document text
    • https://9aef9be9-4304-4ec6-b02b-ded1eabc5d1b.filesusr.com/ugd/a571b8_f0ecb2367ea1465fb1f799c3045a110c.pdf?index=trueIn PDF document text
    • http://muxekatuwig.epizy.com/believe_in_yourself_murphy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b35f0319-3f55-4d5d-bdea-d15fa7b447ed/gevoxudare.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_off0000f0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AF 5360 bytes
SHA-256: b1d87856d8f31ee82f60962e25c050810d747e5ebe7ff1ba066b9010ab2d2659
font_01_sfnt_off000102f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F9 12752 bytes
SHA-256: f3f352856ff98497477f9d87b9016dfbe1bc585d748e35b1ddb7d6c136810273