Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3ef4af0fb613dc…

MALICIOUS

PDF

69.0 KB Created: 2020-11-24 19:17:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e4ef9b3b10e0b9f69cc4a4b4bccad60c SHA-1: dcd19158d026739f5519dbaff197b46333d6645e SHA-256: bf3ef4af0fb613dc3765bf8071af18f4c9167849f58805a10afb00e07268c0c3
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 0.9995

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://trafficel.ru/aws?utm_term=earth+layers+worksheet+printable+pdf PDF link annotation
    • https://zalawevovupat.weebly.com/uploads/1/3/0/9/130969727/d296180d624e27.pdfIn PDF document text
    • https://puzalanenezow.weebly.com/uploads/1/3/4/6/134693659/3412174.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5139764a-b973-465d-9e68-b4d5a51f02d1/96209547456.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/35289259121.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/18319458429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78ded8dd-e48c-4077-8109-b906a2a09c71/28955772455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8abb1c8d-29a0-45ef-8cf8-e49c294b59e9/survivance_narratives_of_native_pres.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9bc10da-d628-4ea5-8136-b21a9b88dcdd/fun_facts_about_the_canterbury_tales.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/7343800964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de59cb00-5fe1-47f7-91f8-1de993238a7a/28719072816.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_off0000cfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC1 5484 bytes
SHA-256: 3a7ffd9fde0187761b777291e2b1ebbe7a634fab15e5f9ccf2efbea4ec71cbc8
font_01_sfnt_off0000e276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE276 10692 bytes
SHA-256: b89cc2963121ea14a3dbf4c7ecfdd8f2806097ddd4aca26c7ac2f25729ad1cf3

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