Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f903bc78f34e12…

MALICIOUS

PDF

80.5 KB Created: 2021-03-15 07:27:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4877569ced14e3b47c19dcf98a77d99b SHA-1: 5a5a9825db493ea3bc457d3faa8f6e2a9afe22e8 SHA-256: 23f903bc78f34e122a16af88790b7693fc157c41b9b7c3daa6a7aba890280a05
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains an embedded URL that directs users to a website disguised as a genetics worksheet, likely a phishing or malware distribution lure. No scripts were extracted, but the presence of external URIs suggests the document's primary function is to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/wix?keyword=genetics+vocabulary+matching+worksheet PDF link annotation
    • http://witaseru.iblogger.org/eminem_lose_yourself_ringtone.pdfIn PDF document text
    • http://ighelpcenter.xyz/diary_of_a_wimpy_kid_set_booksy17ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415309/normal_6009dd6162ec0.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/red_dead_redemption_2_online_intro_mission_walkthrough9nrct.pdfIn PDF document text
    • https://cdn.sqhk.co/gulifunanale/dGhegib/doravi.pdfIn PDF document text
    • http://instapodarok.site/96834642275ozzo2.pdfIn PDF document text
    • http://expressvpn.store/825049822593ajkv.pdfIn PDF document text
    • https://cdn.sqhk.co/sokulutesi/ifk6Phf/dragon_land_survey_inc.pdfIn PDF document text
    • http://wei-nmvc.com/download_walkthrough_final_fantasy_7_bahasa_indonesialz06h.pdfIn PDF document text
    • https://cdn.sqhk.co/nodepitow/zshiHHZ/sirojezetiwotu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496597/normal_5fc7b914d4264.pdfIn PDF document text
    • http://zujakupuk.22web.org/63297042141.pdfIn PDF document text
    • https://cdn.sqhk.co/sozasusu/gdicidY/allocine_cinema_7_batignolles.pdfIn PDF document text
    • http://activa-fb.com/how_much_does_health_and_safety_training_costmzr9w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403140/normal_5fee018f5e3dd.pdfIn PDF document text
    • http://uscreditcheck.info/624244611402y6pk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_5fd64408b57d8.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/lezopobigeza/kidawal.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/janemadozapubupofi.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/database_management_system_book_for_bca.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/orbit_er_similar.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/tidutenojasogetifobete.pdfIn PDF document text
    • http://xizokokov.epizy.com/66418313966.pdfIn PDF document text
    • http://taxupot.rf.gd/91273219937.pdfIn PDF document text
    • http://fisuzes.epizy.com/pobaletuwiwigi.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_off0000faaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAA 5700 bytes
SHA-256: 1754c8ce53a9ef00f46ed7df345a3b3da062b8fd2691ae5ea3d2644ccc72e036
font_01_sfnt_off00010e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E09 10612 bytes
SHA-256: 4c7e47b994c4d23ccc94c96c3cb1423922f8240ec5455c94901c6360ac015135

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