Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91826c3c258febf…

MALICIOUS

PDF

95.9 KB Created: 2021-02-23 17:00:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f89c3e1956036dab81725f187777151d SHA-1: 566db934c42fb8feff0364e1264942e98215a8d5 SHA-256: d91826c3c258febf1022087a0f1559243603da2465cf9458e2ff1b5b0e1a335b
214 Risk Score

Malware Insights

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

The PDF contains numerous links designed to redirect users to external websites, with one primary link identified as malicious. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'tabla periodica valencias y nombres pdf', suggesting a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://crophysi.ru/wb?keyword=tabla%20periodica%20valencias%20y%20nombres%20pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419818/normal_5fd97910aeccd.pdfIn PDF document text
    • https://vebusigatibata.weebly.com/uploads/1/3/4/3/134321359/560f63594.pdfIn PDF document text
    • https://jegewovujukevu.weebly.com/uploads/1/3/4/5/134507091/4aa4a45.pdfIn PDF document text
    • http://kepuvofege.22web.org/86788529049.pdfIn PDF document text
    • http://pilarivem.22web.org/24900434460.pdfIn PDF document text
    • https://rumikupim.weebly.com/uploads/1/3/5/3/135310872/ragokemojanoxef.pdfIn PDF document text
    • https://movediwifed.weebly.com/uploads/1/3/2/6/132695881/fusetojujuzog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nitirew/concepcion_industrial_corporation_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/what_does_courage_mean_in_the_bible.pdfIn PDF document text
    • http://nivawuxiki.rf.gd/firefox_esr_52_portable.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/high_graphics_android_games_offline_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/13937285525.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/woxegavewudotote.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/paradise_lost_bangla.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12556 5260 bytes
SHA-256: f17a6729b820bd5bcaea70ca60baca3bccbd6277a25c2264dab3906ceb69339f
font_01_sfnt_off00013718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13718 13324 bytes
SHA-256: e3ce5f31192aea33d4c2a0894b9182c990f3df910d78aaa77b4baa0a1d9909cb
font_02_sfnt_off000162ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162AB 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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