Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd8bf8ecbc6f823…

MALICIOUS

PDF

248.2 KB Created: 2021-04-05 21:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b3d40163c535e9f72fd18fcae8f97607 SHA-1: 2a02d217226afd64ae7e08336ee84b5a58f651be SHA-256: 5cd8bf8ecbc6f8233eaf7d888d6a831bd50487bf4a958be4c84492ea1642096f
136 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URL that redirects to a lure related to 'Ed Sheeran over the castle on the hill', suggesting a social engineering tactic to entice users. The presence of external URIs and redirectors points towards a phishing campaign aiming to deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9821

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://gimoguvi.ru/strik?utm_term=ed+sheeran+over+the+castle+on+the+hill PDF link annotation
    • http://nijepatexosanus.medianewsonline.com/chava_marathi_book_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kitijorawul/7Ddij6k/panuxa.pdfIn PDF document text
    • https://cdn.sqhk.co/wawabosamugo/H2Zgdib/87422304744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449181/normal_6029a0c2f11d3.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/Crgdaji/business_process_management_software_comparison.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/WXWRthg/hampton_bay_table_top_fire_pit_propane.pdfIn PDF document text
    • http://vonexalux.sportsontheweb.net/desez.pdfIn PDF document text
    • http://manidat.sportsontheweb.net/dell_r710_hardware_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420760/normal_6037e11b2c3b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404969/normal_600cf710f34bf.pdfIn PDF document text
    • http://tumuduwaju.mypressonline.com/roxopuxudukuzajodilefikuv.pdfIn PDF document text
    • http://dapajurop.mygamesonline.org/kawasaki_ninja_300_serviceplan.pdfIn PDF document text
    • http://talajifit.mywebcommunity.org/negano.pdfIn PDF document text
    • https://cdn.sqhk.co/kanedufopuma/hiecOCj/kegidigizerawinutakife.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/statistically_sound_machine_learning_for_algorithmic_trading.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nowimirozox.atwebpages.com/kifal.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/bepanah_full_song.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/43995689007.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/men_s_t-_shirt_mockup_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/rimikegi.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/fofewidulaxedarir.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/12th_half_yearly_answer_key_2018_maths.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/coffered_ceiling_beam_width.pdfIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/ridof.pdfIn PDF document text
    • http://bilofudako.onlinewebshop.net/biomass_power_plant_working_principle.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00011441.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11441 214428 bytes
SHA-256: c3f78bdc8471a47b46de72bcf1852580fe41bd67f276e385d6893e1a9fdcb033
font_01_sfnt_off00037f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x37F27 5044 bytes
SHA-256: f870f18115ab00ce063df81c3b84ecaaf587a4d66c310a071c2c0cda2b64625f
font_02_sfnt_off0003904e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3904E 11652 bytes
SHA-256: fff552af782e05b46b6f3ccecc54b2a11068534ee874c5221957dbf4bbc8d806
font_03_sfnt_off0003b866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B866 16568 bytes
SHA-256: aa462cf6a960d3bac5951578d495425ccfdb38964f8d4f68a07b8585ddb1a5e6