Malicious PDF — malware analysis report

Static analysis result for SHA-256 b372e51ebd625cf5…

MALICIOUS

PDF

73.4 KB Created: 2021-01-23 06:52:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9ec9550016683b2bc78adce78034f870 SHA-1: 50fd790ea2c8f791741f39925ff730a22b51c3f3 SHA-256: b372e51ebd625cf558fc49b9c6c2496b740421a690487c5526e3f64602fb0489
126 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL 'https://trafffi.ru/aws?utm_term=bangla+movie+sathi+full+hd' appears to be the primary lure, disguised as a search result.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffi.ru/aws?utm_term=bangla+movie+sathi+full+hd PDF link annotation
    • https://cdn.sqhk.co/refowofiros/cGhghd6/14024200295.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452607/normal_5ff7569475eca.pdfIn PDF document text
    • http://biduwupukipajov.22web.org/english_alphabet_worksheets_for_preschoolers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497687/normal_5fffb5d63285c.pdfIn PDF document text
    • http://ropufogesuzazeg.iblogger.org/netflix_s_not_working_on_plane.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/YhifHjc/harry_potter_polyjuice_potion_punch_recipe.pdfIn PDF document text
    • https://site-1176433.mozfiles.com/files/1176433/grumpy_cat_movie_rotten_tomatoes.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/yjjWgij/kigikidod.pdfIn PDF document text
    • https://site-1241632.mozfiles.com/files/1241632/guwusagenazemujunifinu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://litopuputorer.rf.gd/diablo_2_median_xl_assassin_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/instagram_followers_apk_app.pdfIn PDF document text
    • http://mezexefobotero.epizy.com/kujak.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/boom_beach_private_server_apk.pdfIn PDF document text
    • http://webidiwotew.epizy.com/43427417495.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/handlebars._js_template_example.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7D 5332 bytes
SHA-256: 16f95b8646aa48a1924c8e9b96da035cae2e981d0fe23c6a3cd3dfb9f661a2a9
font_01_sfnt_off0000dd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD87 4204 bytes
SHA-256: 10eaae5897fc34d7368736be3fdf96c70cf6d8f280ac40af4a9ae0561cd4a8d8
font_02_sfnt_off0000eaed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAED 2116 bytes
SHA-256: 991f7ef292b59849fa1804c361c52a6255426db797fbcab3b5d31d1f34ee76c9
font_03_sfnt_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 10420 bytes
SHA-256: 7c07fcf06c16aeb6a0c46a122d37d9f6019e62090918f688d8021f9a858d4572

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