Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd1e4ef1efe667f…

MALICIOUS

PDF

96.5 KB Created: 2021-03-31 20:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f1954f8cbbcea903b441b14616701e84 SHA-1: 3087bed1d651d0d8d247db81ab8fcedeadc3ba23 SHA-256: 1cd1e4ef1efe667f95790cb9adbe21bdd97d9fd7b79973ff12362688c4d48de3
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links to various domains, many of which appear to be disposable hosting for SEO-optimized content. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm. The presence of an embedded URL and the ML classifier's high confidence score suggest malicious intent, likely related to phishing or distributing further malicious content through these links.

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://resalured.ru/award?keyword=building+automation+system+integration+pdf PDF link annotation
    • http://5coupons.info/54606856789u39p1.pdfIn PDF document text
    • http://all-host.site/nixozexadowpv0vh.pdfIn PDF document text
    • http://likelid.xyz/nepizetochfal.pdfIn PDF document text
    • https://rugexivik.weebly.com/uploads/1/3/1/0/131070765/nebodogoxot_jabarabeduvowez_logawexum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417222/normal_5fe957e9ba76e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448986/normal_6001c1f1d3b35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485450/normal_5ff0972e7c891.pdfIn PDF document text
    • https://muwikilakejo.weebly.com/uploads/1/3/4/5/134519857/teteveneneje-vumetozoware-lumak-besomi.pdfIn PDF document text
    • https://kabijefilomi.weebly.com/uploads/1/3/4/7/134761935/3334800.pdfIn PDF document text
    • http://ca-management.website/987170477493w2oe.pdfIn PDF document text
    • https://fedaxowazujiwiz.weebly.com/uploads/1/3/4/0/134012387/53074c0ee6d68d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459625/normal_6061d4760850c.pdfIn PDF document text
    • https://nitomono.weebly.com/uploads/1/3/1/4/131454496/kokisodotog_ritepu_lonujegisev_varudolabop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://52ed6390-a5c1-4502-9f93-599cf6d98ad1.filesusr.com/ugd/f7fbc8_4a362f83670449828069f62d699aa646.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/sepanizoza.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/mobelovuzevimufubowegike.pdfIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_271f90f34959473abee1148894712736.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zexozavo/76382772123.pdfIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_c939f981dadd4235a49f36c0bed14ea6.pdf?index=trueIn 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_off000139df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139DF 5512 bytes
SHA-256: 2f5af332844ae65542505cd4668d24a8b89c2854d0a9f4411535744e92c7b245
font_01_sfnt_off00014c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C93 12060 bytes
SHA-256: 479e07e983819ade2931d1d81d5152de4d97d1bf92459cb1ea743d382483245c

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