Malicious PDF — malware analysis report

Static analysis result for SHA-256 70f3301cd13f9f52…

MALICIOUS

PDF

79.1 KB Created: 2021-04-04 19:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bc91fadd8b5aabff82a41f4de65a3e6c SHA-1: 012db3726061738dee3d699133cceebd495b5434 SHA-256: 70f3301cd13f9f527be089dc29343261c2dc7a6f01d3f5dc44c204a1100ac4e2
164 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. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gimoguvi.ru/123?utm_term=brothers+in+arms+3+hack+apk+2019 PDF link annotation
    • http://kudusakepupa.sportsontheweb.net/acceptance_and_commitment_therapy_exercises.pdfIn PDF document text
    • http://tujukesabegakom.mygamesonline.org/johnson_9.9_outboard_motor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420748/normal_6013276d174d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413838/normal_6047fcf35cd9f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_59e5e802184a42e994498ec8acb91d6a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/11479167052.pdfIn PDF document text
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_4ef6af2574004f838d71d38bd27b70d8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vapite/12178890571.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/how_to_remove_a_maytag_washer_agitator.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/jirelomilakamekuwafipu.pdfIn PDF document text
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_f6994a58918242e599c1ec4f5ac38207.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovigebi/wedding_vows_for_her_template.pdfIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_40aab4edf740499fa0ff89129fc2c46d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/job_interview_questions_to_ask_a_supervisor_candidate.pdfIn PDF document text
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_8d2abb7cd87d45e2afd78ac1d9d3bb22.pdf?index=trueIn PDF document text
    • http://duxepivol.myartsonline.com/capstan_and_turret_lathe_machine.pdfIn PDF document text
    • http://xukokumo.myartsonline.com/relative_clauses_exercises_advanced.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_off0000e923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 5900 bytes
SHA-256: e7a43b8f94b48f0d9c602c16bd16f56368b5e95c2e6e676270439ca4b1c2bc4b
font_01_sfnt_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 15672 bytes
SHA-256: c38ebdfa77a49cbe3dda922e3d09e4266db9325e5e73847209ae231deb6bde22

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