Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3bb94336c22be4…

MALICIOUS

PDF

71.2 KB Created: 2020-12-14 22:31:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7c820b96d34df15784290579150861bb SHA-1: b35e555c8684e8786a5e5e1d9d26f510c8bfb8dc SHA-256: fa3bb94336c22be43025582941ec97194cfc09f38460258a2b3763cf68f7faf0
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://traffset.ru/aws?utm_term=amended+1099-+misc+form PDF link annotation
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/fisubamidizozun.pdfIn PDF document text
    • https://gewosawoma.weebly.com/uploads/1/3/0/7/130739201/7e3102863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5f998d42ac499.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/785c26ac87cc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383918/normal_5f91a520cfa74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419851/normal_5f97abcfdaf1a.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/6578987.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/5fc5acadaffbf90a660b1fb2/t/5fd627935b1f6f7539cfda95/1607870356130/free_offline_niv_bible_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/xomawomeba.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d9d28787e879896bb85a/t/5fc42f57a97599144e7cb188/1606692696762/30620514937.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/pepofadurejiruruda.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/meme_music_violin_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/wipuvurusapegifenanuzor.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/61055208979.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4cc22affbf90a66037377/t/5fcf763d7cc0b10a0ad2748e/1607431742181/halaman_kontra_kulam.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_off0000db0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 5296 bytes
SHA-256: b27dba52751cf6e9c2399aa0d1b0bc13ea8e3c33e40712a85647d3f67ad2b86f
font_01_sfnt_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 10412 bytes
SHA-256: e7085c9398761ac421acfe0fd617288881d253cff2c465c00ffdaf88ab106ffa

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