Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec32d3b0b4cb75d2…

MALICIOUS

PDF

72.1 KB Created: 2020-12-05 20:15:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 52e639c00e4b91406a03421cd9ee0c6b SHA-1: 90c419e6073fe217987b5f083e167580d2a081aa SHA-256: ec32d3b0b4cb75d2682fd9ebe5e324305b5c61a1c45b78da5d7236a96e7c538f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, designed to redirect users to malicious websites. One such link points to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://cctraff.ru/strik?utm_term=sangean+atomic+clock+radio+manual In PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/2890940.pdfIn PDF document text
    • https://nasijominazol.weebly.com/uploads/1/3/4/3/134366940/wipapox.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/5473886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386837/normal_5f95935b9c29d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/137d0f46-2761-4358-82c4-9c56fb587bd8/kardo_kardo_beda_paar_radhe_albeli_s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee34d378-808c-4b8d-aff3-8f84ccf39c6e/fedex_cardstock_colors.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/9178898656.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/tensile_strength_of_metals_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/gojubitatixiwor.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc17f7ea13a450babf85411/t/5fc3892e3f75b1664341e578/1606650163042/27228488357.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5659f6609fd0ee7af9d99/t/5fc91d629fc9d861d85ff173/1607015780680/screen_time_control_app_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/bubble_bobble_nes_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e79f4d2c-8ea5-40e1-ae46-8229b3eb795e/7849856731.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C4 5128 bytes
SHA-256: 8a4aa1e9c2c417a1364816c3079ebebfab2c3286b2010e8fdb8886bffcf84f15
font_01_sfnt_off0000e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 10092 bytes
SHA-256: 57ec75a47a0854bab5ce7784b3850be80d28b9b912cbb5420723b68bf18c71d4
font_02_sfnt_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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