Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cae7dcf0575dd2d…

MALICIOUS

PDF

81.2 KB Created: 2021-06-13 00:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9f5aa6c7a4a3e0b54192b72cae632d3f SHA-1: a8e368f638ec10d6bceb9936f87b44977ea3f48b SHA-256: 3cae7dcf0575dd2d9d0e49bd2ec00f497c33855896c2c6411b20c68f95b8cfff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of external URIs and a 'download button' heuristic suggests a phishing or social engineering attack. The document body, though heavily obfuscated, contains references to 'Among us' and 'download', reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/pbw?utm_term=among+us+v2020+11 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365608/normal_6003a89abceee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465935/normal_605eec0d2f71b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472479/normal_6062e06cbff5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464710/normal_606a0978d87bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530036/normal_6039216e4a90a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389085/normal_602d80c9cc3f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390324/normal_601a3f9d543f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd5b36a1-8ff4-4dab-bd6f-c9615e1053e7/61375093076.pdfIn PDF document text
    • http://vipafuwusawe.pbworks.com/w/file/fetch/145104183/tonenepibaselotejogo.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/w/file/fetch/144581271/2187907044.pdfIn PDF document text
    • http://zosajivapesi.pbworks.com/w/file/fetch/144542976/how_to_download_seus_ptgi_e8.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/f/tashan_full_movie_watch.pdfIn PDF document text
    • http://fawitugeva.pbworks.com/w/file/fetch/145078179/75358844952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5367c4a6-2baa-44f5-97ce-6be0e198242b/samsung_sc-d382_mini_dv_camcorder_manual.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/f/does_2020_camry_have_android_auto.pdfIn PDF document text
    • http://fosirodovo.pbworks.com/f/marvel_contest_of_champions_hack_no_survey_no_human_verification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/436de976-d35f-457c-93a1-cc94febd9213/arduino_uno_board_layout.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96297d3d-2cdc-4806-b3c4-9edbe3d404a5/whirlpool_wher25_replacement_filters.pdfIn PDF document text
    • http://jutifakukap.pbworks.com/f/betty_crocker_recipe_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ed0b0bf-6bd7-4cab-9f5e-a1e7f337a513/temiwomosarafubove.pdfIn PDF document text
    • http://wuvebag.pbworks.com/w/file/fetch/145074054/kafufusiwizebizuwe.pdfIn PDF document text
    • http://milatufed.pbworks.com/w/file/fetch/144955362/streaming_fantastic_beasts_the_crimes_of_grindelwald.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_off0000fc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 5040 bytes
SHA-256: c1b563d38e8ee1d573540b12cee340a7b59f4dc5ff433bcbd05241fc476ae90c
font_01_sfnt_off00010d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D84 12500 bytes
SHA-256: d1550c1fd5c8184a36177de89822867fa479ba94937245d6452f4b3fb673f403