Malicious PDF — malware analysis report

Static analysis result for SHA-256 158cfa665f442580…

MALICIOUS

PDF

89.0 KB Created: 2021-06-08 21:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: a5589621a552def600f54571cf9b89d6 SHA-1: ec84eb82de3ba1b7de9f9710b32fbd24e78793b0 SHA-256: 158cfa665f44258019847d36d2cd3de83153a7806da00090092df91bc298fecb
116 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a QR-code lure. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://krisoc.ru/pbw?utm_term=input+and+output+devices+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4498376/normal_5ff8d9dd8a42c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452845/normal_606acef646f68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489615/normal_6029907293e9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383561/normal_6034819f231b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481522/normal_6051098975f9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389355/normal_5ff610a34a25b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390081/normal_5fd1ef8c383b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410962/normal_5fc9238046fa6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411932/normal_601840bc2dc48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503279/normal_604f7eaf0e906.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472488/normal_60034979c15dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453720/normal_5fd0a27733c91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380887/normal_604ced7a6d3f1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pulixojesu.pbworks.com/f/how_to_join_hypesquad.pdfIn PDF document text
    • http://jabodawo.pbworks.com/w/file/fetch/144608511/bob_marley_dont_rock_my_boat_live.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74d6a264-46a4-45b2-aba1-4f81044fa67d/xirolozu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6dc2dea-45d9-4946-b17a-33ec17a0cf7d/the_way_things_work_game.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc3a6d89-ee20-4c01-b65e-db7e5bc3a200/55863021002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b32672a-c637-4bfb-b2cb-aa58d197614d/how_to_use_ww_microwave_omelette_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26f19540-c3b0-4186-a93d-7410a6a99a80/12777514093.pdfIn PDF document text
    • http://dejapitud.pbworks.com/w/file/fetch/144799494/how_do_you_cook_hard_boiled_eggs_in_a_dash_egg_cooker.pdfIn PDF document text
    • http://xemademeku.pbworks.com/f/5876260560.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_off00011e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E53 5240 bytes
SHA-256: e5fabe1ae852b1e3241442bc85f68c7fe6f49e880246462cc18494dfd7dd40a7
font_01_sfnt_off00013050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13050 11200 bytes
SHA-256: e9f388c266da62f096311a73e6fb86bfdc7b66ec9e38fdd4cf5cac5b8e8141d7

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