Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d2ffd255f553ca…

MALICIOUS

PDF

66.4 KB Created: 2020-12-16 23:07:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8e0975e49a4605c09e5dafa1a67c2471 SHA-1: d3a5f88e5741bddefeb7aae0e217b7a0a1c6f760 SHA-256: 54d2ffd255f553cafd0d5f1b9344bc8393b8e8457de081a5b92478b623cce4e7
186 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 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafftec.ru/123?utm_term=tokyo+free+guide+espa%25C3%25B1ol PDF link annotation
    • https://dowikawi.weebly.com/uploads/1/3/4/7/134741621/levikaforeligusu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470205/normal_5fa556b8e9652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383703/normal_5f8da07071bef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367687/normal_5fc86bffcb7ba.pdfIn PDF document text
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/bebosugetediso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367952/normal_5fa7c52a21d0f.pdfIn PDF document text
    • https://sizomejuxitiz.weebly.com/uploads/1/3/4/7/134748976/a63c7d803b107c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369187/normal_5f98d0cba3b23.pdfIn PDF document text
    • https://dudikojegak.weebly.com/uploads/1/3/1/4/131406444/d3c80fc2a421b.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/a6f4414f-3b36-4cdd-995f-22ec04d24aee/20161765616.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/barracuda_message_archiver_outlook_add_in.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ed730e-5a7f-4604-9ff9-30356cbd9550/asus_repeater_mode.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_off0000c30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30F 5536 bytes
SHA-256: 42b1c65b486cba2b9792b27211aae8031430bf769239dd0fd377189af7872c61
font_01_sfnt_off0000d5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C8 11276 bytes
SHA-256: b0bbec72bb3735fbcbe877684f89906a05c62a52094a7dd150c7c832f22b01df

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