Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc452a0462c4a1a1…

MALICIOUS

PDF

78.7 KB Created: 2021-03-28 18:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 844c7af2d276d80638444aec9fc93f95 SHA-1: dc8ac62e03149c8a440ea10a052174bea4c315d6 SHA-256: dc452a0462c4a1a120d2b925be0208b0df0d3a2c559afd2861a819c3322c6bfa
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to link farms designed to host SEO spam or redirect to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=tracking+laptop+computers+with+uhf+rfid
    • http://fafesixokegigi.getenjoyment.net/xipifexezako.pdf
    • https://cdn-cms.f-static.net/uploads/4417999/normal_604931dbee96e.pdf
    • http://rawoxaxevog.mygamesonline.org/simpson_power_washer_reviews.pdf
    • https://cdn-cms.f-static.net/uploads/4369495/normal_5fdb5a1a9ac81.pdf
    • https://cdn-cms.f-static.net/uploads/4411926/normal_601001e1e1741.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_86b205e188804944867cc1feb8bece28.pdf?index=true
    • https://s3.amazonaws.com/xakusineba/83135967423.pdf
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_ca9974d9a14d44a18fbe2f94066b939a.pdf?index=true
    • https://s3.amazonaws.com/jenisozazewubo/27629071527.pdf
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_6dc95adb42ea4e36bb57c338de8cd08d.pdf?index=true
    • https://s3.amazonaws.com/tisegovofu/securecrt_latest_version_free.pdf
    • https://s3.amazonaws.com/gosete/watermelon_nutrition_information.pdf
    • https://s3.amazonaws.com/sojuravewi/73914418747.pdf
    • https://s3.amazonaws.com/libeganot/vebinux.pdf
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_43441fa60c62417fbf3959158cacced9.pdf?index=true
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_06ad12059b70450bb18be98d2492a4dc.pdf?index=true
    • https://s3.amazonaws.com/gurupixabogivaz/bribe_ullu_web_series_480p.pdf
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_aefe8b4fa7db48599ff1874886694dee.pdf?index=true
    • https://s3.amazonaws.com/wuwabobujasivor/ludotuxuzap.pdf
    • https://s3.amazonaws.com/tosego/how_to_apply_for_disability_support_pension.pdf
    • http://sazasewugekupej.onlinewebshop.net/disufegiwevavogatujepuwiv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb60.bin
7ef270cda1596220ecc8da094fd513098d6ded35369c835d24fb6f55f9a7a60e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 5672 bytes
font_01_sfnt_off0000fe95.bin
42588448313da81b7e2e0c6d12b94f0556962d459d3d3eb52d2310eeb9131f1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE95 16804 bytes

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