Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d3b13974778b28…

MALICIOUS

PDF

85.9 KB Created: 2021-04-06 11:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0201ebe52632e9de931e356c16ad9f2e SHA-1: 18f0b1c0477fb2c8da9ab179720cc202ecd95236 SHA-256: 33d3b13974778b2896b15b98704474a21c117521e14e7c7aa9d03c94cc0c80fd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, many of which are hosted on disposable or free hosting services, indicating a link farm. The ML classifier and ClamAV heuristic strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://rivoduzajoki.iblogger.org/katovikamuju.pdf In PDF document text
    • https://zizipidefogin.weebly.com/uploads/1/3/4/8/134852386/nefekuvopagu.pdfIn PDF document text
    • http://kufigada.22web.org/lubutenafaxonexod.pdfIn PDF document text
    • http://kawopewil.22web.org/54315828389.pdfIn PDF document text
    • https://pijuvadugodawa.weebly.com/uploads/1/3/4/3/134307721/ada281.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390324/normal_5fd05caf276b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368230/normal_602ab0170dc57.pdfIn PDF document text
    • http://dizejujiw.iblogger.org/urdu_grammar_books_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/G1IkLG9TFNM/wb?keyword=what%20is%20the%20story%20the%20ministerPDF link annotation
    • http://kuzojepume.epizy.com/ajax_post_file_c.pdfIn PDF document text
    • http://nagivozuzosawax.rf.gd/80241736281.pdfIn PDF document text
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_05a86544bcfb4340ad0a1cadb2828fc4.pdf?index=trueIn PDF document text
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_274c66400bcf45a18b8fc489c09c53ad.pdf?index=trueIn PDF document text
    • http://junaken.onlinewebshop.net/42666829908.pdfIn PDF document text
    • https://a6047d18-b57f-4fdc-88fa-dea7715a8642.filesusr.com/ugd/189347_aab011c7e4ed44929da6f84d13273dcd.pdf?index=trueIn PDF document text
    • https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_2b2704f782a04df7b0ef52bda9a0b8ce.pdf?index=trueIn PDF document text
    • http://ligoroxenafof.atwebpages.com/kusuneni.pdfIn PDF document text
    • http://lugipivimefol.epizy.com/zekemebiluk.pdfIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_fd3e540b338c4009ae605af02de033a3.pdf?index=trueIn PDF document text
    • http://wabalegawamiraj.rf.gd/87359464014.pdfIn PDF document text
    • http://tutakaxebi.epizy.com/12944183278.pdfIn PDF document text
    • http://fapadetesiwix.rf.gd/conair_infiniti_pro_1875_hair_dryer_reviews.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_off000110fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FE 5452 bytes
SHA-256: 6c9138847ed22d221b943452c845781a46477381d3e405bcf68df536dba3fde8
font_01_sfnt_off0001237d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237D 11368 bytes
SHA-256: db4b8308cbbf7cb2aec34a103e61ad99de7bc8f72d4475d4bd59996623b9ff63

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