Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa1fd06cb89db5a…

MALICIOUS

PDF

77.0 KB Created: 2021-02-21 21:48:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5441b7c40a8b1d6b6aa09837313504f3 SHA-1: b28e2a9788c5559a3d264cb6792a817c8f101694 SHA-256: 2fa1fd06cb89db5aca7953338a9f1606773076476e3687f7aeec7b305b07bddf
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file functions as a link farm, containing numerous embedded URLs that point to other PDFs hosted on disposable domains. One of these URLs, https://yafferge.ru/strik?utm_term=libros+de+economia+recomendados+para+principiantes, is identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

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
  • 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.
  • 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.
  • 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://yafferge.ru/strik?utm_term=libros+de+economia+recomendados+para+principiantes In PDF document text
    • https://limifotediko.weebly.com/uploads/1/3/5/3/135325738/jubekuludu-jogusimugunila-tizajabugipiwo-lokokowo.pdfIn PDF document text
    • https://pizizidoto.weebly.com/uploads/1/3/0/8/130873839/3952105.pdfIn PDF document text
    • https://sorasewemo.weebly.com/uploads/1/3/4/3/134358680/tubizetumiwe.pdfIn PDF document text
    • https://vezitiratad.weebly.com/uploads/1/3/1/8/131856143/489714.pdfIn PDF document text
    • https://mamafaxugelat.weebly.com/uploads/1/3/0/8/130813750/6dd5fd.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/a4a476ce29a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384323/normal_5ffcbe91dbc15.pdfIn PDF document text
    • https://nanavefog.weebly.com/uploads/1/3/0/7/130775134/ccf0969d5502cb.pdfIn PDF document text
    • https://lojapajarete.weebly.com/uploads/1/3/4/5/134521209/titimezelobufi-poxosikururubij-zonowuf-nalemibuvek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388174/normal_6025ea4f4f0c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453560/normal_5fdbe8eaec2bd.pdfIn PDF document text
    • http://gratoram.site/palolijazo2w293.pdfIn PDF document text
    • https://rejomopoxe.weebly.com/uploads/1/3/1/3/131383333/viluworon.pdfIn PDF document text
    • https://bazunebusa.weebly.com/uploads/1/3/5/3/135397504/fovodubomabowag.pdfIn PDF document text
    • https://bemisawu.weebly.com/uploads/1/3/4/7/134716701/91515a.pdfIn PDF document text
    • https://nulixosur.weebly.com/uploads/1/3/4/3/134311840/55af42c2ab21d57.pdfIn PDF document text
    • https://mizijuwewis.weebly.com/uploads/1/3/4/3/134392366/diriwadope-sudogare.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ed41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED41 5268 bytes
SHA-256: 9a919ed47cc72a8b78a9f1773b775cf9075e39ea9fdbecfd92aadfa5c452203e
font_01_sfnt_off0000ff09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF09 11580 bytes
SHA-256: 188d772e762a5b1159b301b8d705c23b3042fba29192142a880bb3f4ec4a1a4d

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