Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4b7f17b078a965…

MALICIOUS

PDF

76.6 KB Created: 2020-12-25 18:32:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ed17465c373463716ca6467bf570ed1c SHA-1: e53dcb4179285ac8bf595ecfc58cd3c7ca5b3952 SHA-256: 0d4b7f17b078a96571e3af08521bf5f0bc79df1a9962527109396dbca0cf9ceb
126 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 external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier strongly flagged this PDF as malicious. The embedded URL `https://trafftec.ru/strik?utm_term=maximum+carry+on+size+southwest` is likely the primary destination for the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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/strik?utm_term=maximum+carry+on+size+southwest PDF link annotation
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/bevakupafi.pdfIn PDF document text
    • https://cdn.sqhk.co/kidobogi/uMljiha/45749719225.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463279/normal_5fce8614a7767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475379/normal_5fbc1f1ee9630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_5f97032d68010.pdfIn PDF document text
    • https://xofeboje.weebly.com/uploads/1/3/4/5/134584890/9977a48d2d94.pdfIn PDF document text
    • https://zokejiwiperasuk.weebly.com/uploads/1/3/4/6/134668939/3096666.pdfIn PDF document text
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/2871741.pdfIn PDF document text
    • https://konegodifoxud.weebly.com/uploads/1/3/1/3/131380175/lodubabatig.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/bbb91eb1-9b3d-405c-ade6-a008f43340f6/49795703185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0978dfa3-02fe-431b-bdf8-b45faf26231c/vibosadojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04dc187c-3c9d-4d2b-a927-8b35ebf0d2c4/89873519092.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_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 5324 bytes
SHA-256: 4257ab1712de2edde921722c6dc29f17861e22b9a1241b71cbdfb7d1ff6388f2
font_01_sfnt_off0000ff50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF50 11248 bytes
SHA-256: db874e8bbd1ca2e26149f994ef2f9996d667c3b58060158318a8311439dfdd04

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