Malicious PDF — malware analysis report

Static analysis result for SHA-256 424480da092c94f4…

MALICIOUS

PDF

73.8 KB Created: 2021-03-14 23:15:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 59dec4f62e617513cf4c7a1a929af00c SHA-1: bb6a5f0d2e31cbaf36439d57f91bd7ac0e367175 SHA-256: 424480da092c94f4d28822e94334eab747d914d07862d6f90129faeb1b37c4d9
136 Risk Score

Malware Insights

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

The PDF file contains a lure related to "Ka24de transmission mount bolts" which redirects to the URL https://zajinet.ru/strik?utm_term=ka24de+transmission+mount+bolts. This URL is flagged as a redirector for phishing. The ML classifier and ClamAV detection strongly indicate maliciousness, likely a phishing campaign leveraging a document lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=ka24de+transmission+mount+bolts PDF link annotation
    • https://cdn.sqhk.co/vusopukov/ijjh7ic/zolefawolirufovofifefida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415936/normal_60102a0edc074.pdfIn PDF document text
    • http://italiahot.fun/fatevelaxalenanodekixesy3qq2.pdfIn PDF document text
    • http://useraisins.pro/ejercicios_de_arboles_de_decision945ai.pdfIn PDF document text
    • https://cdn.sqhk.co/wowixepis/iGfgfyC/digebimokawomonozavebuv.pdfIn PDF document text
    • https://cdn.sqhk.co/godezixibufo/gieHyha/guide_for_free_fire_booyah_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zirizowesaw/cuszihJ/world_cup_1990_qualifying_concacaf.pdfIn PDF document text
    • https://cdn.sqhk.co/lovuzegonu/gdaifqY/bugaxuniwimizarufezim.pdfIn PDF document text
    • http://price-list.moscow/zelidojeliwx5zmt.pdfIn PDF document text
    • http://magnitoli-2ekran.site/diy_stress_ball_flour_and_waterdgtmm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491925/normal_5fe99611526c9.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/liwara/nevewituwi.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/40521456134.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/21211459741.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/64187179104.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/fur_elise_piano_sheet_music_musescore.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/75632005487.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/rajugiz.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/amazon_kindle_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/dragon_ball_z_fighterz_android_21.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/beautiful_kari_jobe_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzotisenixava/jetetepojopapimo.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/what_does_time_travel_mean_in_physics.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/41541022436.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_off0000e16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16B 5300 bytes
SHA-256: ddfd1e73cb38498d902270676fa7f1d4ace9113dcd875ffe6d2038bb894cfb5b
font_01_sfnt_off0000f364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 11244 bytes
SHA-256: 8b22e1db9054f5495c83f69cf3adb3b6dbe6e977483e4c5b3439d8cdff7fad40