Malicious PDF — malware analysis report

Static analysis result for SHA-256 850a500130c0b393…

MALICIOUS

PDF

83.1 KB Created: 2021-04-23 10:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3350a605f83f404333e9ffcbdd1bf2e1 SHA-1: 91c3ae9fd5bbcf6c59cf236d2ec9b48457c3bf39 SHA-256: 850a500130c0b3931e447d6e6cbf6a07314d86d54602bf2b5c8411392207bd9d
136 Risk Score

Malware Insights

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

The file is a PDF that uses an image lure related to 'Monsters vs aliens tv show cast' to redirect users to an external URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URL suggest an attempt to trick the user into downloading a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/strik?utm_term=monsters+vs+aliens+tv+show+cast PDF link annotation
    • http://dashcamtopbest.com/170396049264518n.pdfIn PDF document text
    • http://xoroketogejuxe.mywebcommunity.org/55406579828.pdfIn PDF document text
    • http://dmdmassage.com/59906149648e9gtc.pdfIn PDF document text
    • http://lastmarkt.ru/libros_para_aprender_japones_desde_cero_gratishqjz9.pdfIn PDF document text
    • http://cabinetsop.xyz/banished_tv_series_episode_guidehbo55.pdfIn PDF document text
    • http://mon-cmso.best/the_complete_works_of_florence_scovel_shinngui50.pdfIn PDF document text
    • http://subbellassecret.com/79099948073rgr.pdfIn PDF document text
    • http://lnstagramcentre.net/29847762654g3nsz.pdfIn PDF document text
    • http://bonboxstudio.com/safomibobazagetufobwp8x.pdfIn PDF document text
    • http://femonejigajape.mywebcommunity.org/vesurexesawe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/a_format_such_as_cell_shading.pdfIn PDF document text
    • http://jaxunukologefis.onlinewebshop.net/xavaminafiveguzozit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e456355b-6680-49b0-8bc2-5c716a79d0b5/dolim.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/tuxudaburuvikewogorupare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b9a3ad3-5814-4aae-a662-3ff48d1ad2a4/how_to_money_cheat_on_farming_simulator_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9120c51-416b-4a96-9d6d-be1f4d457ae2/xinopunasufikuli.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/14278024485.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/diferencia_entre_modo_de_produccion_feudal_y_capitalista.pdfIn PDF document text
    • http://kivarutumo.myartsonline.com/autocad_electrical_free_download_for_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cbcd292-f46f-4d47-8587-6aa6e89718fb/32540660577.pdfIn PDF document text
    • http://fabevax.myartsonline.com/fisco_agenda_2020_mexico.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/suvutexilibofatijukukase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37d44506-d19a-4a16-9178-68b2209da193/34972016005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0aae0f1-728a-4b94-b9c5-7d26649275a1/med_el_sonnet_2_price.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF716 5044 bytes
SHA-256: 56fe8ea03fc54d4a5fec3e19ea24ad5d68e05582fc817ae080915fe506817951
font_01_sfnt_off00010851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10851 3408 bytes
SHA-256: 6288655a89d6cab30c9d2990cde9d2fa983fe1725881bc08f908df386ba2c215
font_02_sfnt_off000115a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A4 12032 bytes
SHA-256: 8cccafdfd44c1247d4253d9c046b33db3ea4b49b2d6e50606b63b2526aa6223b