Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb735c2bda64807…

MALICIOUS

PDF

71.4 KB Created: 2021-03-15 05:57:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5d854447adb3044be3e448e7185356f3 SHA-1: 1a4a1cd01df8a741399bd957a976b3087344e422 SHA-256: fcb735c2bda64807918a69603862a13889a4bb5dd5bfa820608f904ee99d3e30
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many pointing to disposable hosting, and one critical link to a known malicious redirector. The document's structure suggests it functions as a link farm, likely intended to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dafemum.ru/strik?utm_term=critical+hit+led+dice+set In PDF document text
    • https://cdn-cms.f-static.net/uploads/4466657/normal_6043085fd65da.pdfIn PDF document text
    • https://julotovodirol.weebly.com/uploads/1/3/4/5/134522883/81c429ed82855.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469136/normal_600400d9b00c2.pdfIn PDF document text
    • https://namerodedisa.weebly.com/uploads/1/3/4/7/134771167/6072045.pdfIn PDF document text
    • https://lugumeduzox.weebly.com/uploads/1/3/0/7/130740149/dizogalopedusa.pdfIn PDF document text
    • https://zanewodibamejat.weebly.com/uploads/1/3/0/9/130969445/gamilagu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365660/normal_5fcefedf7da0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427300/normal_5fcc8e73c0cf3.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/bogag.pdfIn PDF document text
    • https://zetodimamewiwek.weebly.com/uploads/1/3/2/3/132302859/1cd54e.pdfIn PDF document text
    • https://zanefasijim.weebly.com/uploads/1/3/5/9/135965469/b3fd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404133/normal_603c2bb442e75.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_cc6a4556e1da43dc9111d1034d4ec28f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c53a22db-aa58-4f2e-b7ef-741db73afa17/in_the_heights_hbo_max_trailer.pdfIn PDF document text
    • https://7ae774ad-b64d-4473-a0b1-aa0db1e39e83.filesusr.com/ugd/3e7897_3eafa78b5a11497487274da94921932c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/jufewefowasufatilise.pdfIn PDF document text
    • https://badbb018-ab4e-499b-b788-960949b82e3d.filesusr.com/ugd/4f4c56_bf5404cead614c2bb2ca70cb126c7dd7.pdf?index=trueIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_a7f15ba832724f2a85392e69e73bffe4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86e7048f-a8df-41d7-aa53-dfc994cd93d5/roland_tr8s_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/38325237840.pdfIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_19c6e2e7dce4459991cafead0a3809de.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/lipids_biochemistry_mcqs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4d7b7df-d7f4-4512-a30d-1b50f87a7c97/9608352814.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_off0000d6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E7 4932 bytes
SHA-256: 5b2130bb09fbed9a09f1c1a7a3e3164a580fee815d25fb84c27ab3bb355b9c35
font_01_sfnt_off0000e799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 11444 bytes
SHA-256: 4d32f8d826038f48dd77bfe22b041d14af8616ce4a28231c89ebdf017dd1a645

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