Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88ea5442808b541…

MALICIOUS

PDF

152.3 KB Created: 2020-12-04 23:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 8929a7d4f632c1d09930c3c01acdaa8d SHA-1: 90f543a4ba0b9ac7e77064cd2678dc821bd32a36 SHA-256: f88ea5442808b5419704df01ee93fce0d305c3872fed65043665651dec78aa6b
154 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 routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://traffmen.ru/strik?utm_term=erin+hunter+survivors+series+1 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4426682/normal_5fc949882c918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375885/normal_5fae0a819b7db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5f86fbdacd36f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484355/normal_5fc8a12fe2cd8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd08482c6de34c7a3a6292/1606223947997/post_tension_slab_cost_per_square_foot_in_india.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0805cd49dd12447321748/t/5fc34f2518e72e5fdb420246/1606635302343/64940200321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78926392-d383-4ead-8805-4a1a2cbfda5d/delonghi_pinguino_portable_air_conditioner_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/776302f5-0be9-4c8d-a186-d0685ac4ab03/5th_step_aa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1576327a199023ab86c6c/t/5fc2b3c59ee0f32b87abef83/1606595525556/march_20_2020_video_game_releases.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4dac4ec917750a3f10bd2/t/5fc70209a3696915e21a1341/1606877706428/game_creator_app_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b6ee183-a594-46f3-99fd-a93238d5f450/titaxupajebikak.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d446ab79f442f2293e00/t/5fc3b4ae9b1ed035384e3154/1606661295645/liburab.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f8dcc6229360ecad579d/t/5fc67873a97599144ed89a63/1606842484628/royal_oak_archery_club.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc145c30a2757459be55efb/t/5fca745ea08b9342fa9a52fb/1607103585278/harbour_city_toy_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8d477e-417d-4a1e-9a8f-5454e434a9fb/sexumo.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_off00021f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21F11 4600 bytes
SHA-256: 4906826551cc58d1d2b8da35235bea6727c990333a2c3073352089a5971d61a9
font_01_sfnt_off00022ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22EBC 10776 bytes
SHA-256: ef896551fae962f740b7d3353c6e27d1c9dbc5f7d5bcb7578a6090b7606c296e

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