Malicious PDF — malware analysis report

Static analysis result for SHA-256 64cd84392065b833…

MALICIOUS

PDF

78.8 KB Created: 2021-03-06 04:16:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a118811e77fed78006f7e6997d6fa33f SHA-1: 74d7405d6cf44d97a7d78db30274d39e0f9b14bb SHA-256: 64cd84392065b833f6e91d6cceb3e9cdb291b760c3025e693307289fcbb9e3ba
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains references to book summaries, likely serving as a lure to disguise the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://golowaki.ru/aws?utm_term=percy+jackson+sea+of+monsters+book+summary+shmoop PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410976/normal_5fc91ccf8828e.pdfIn PDF document text
    • http://nizavevorupuj.mywebcommunity.org/kurunijaxisipolemogebuzir.pdfIn PDF document text
    • http://xebiniseba.mygamesonline.org/caesura_in_beowulf_with_line_numbers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382770/normal_5ff4d679e04cd.pdfIn PDF document text
    • http://zovofuti.mygamesonline.org/skyrim_how_many_quests_does_the_night_mother_give.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489057/normal_601cf98e3eebe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465390/normal_5fe56dfa586e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493545/normal_6034f7a7012a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384647/normal_6011726abc74c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_601540dcb7caa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382430/normal_5fda68f65de12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4f709c8-2107-4485-895c-4c2f2b745b49/how_to_get_rid_of_ivy_ground_cover.pdfIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_d50b329df929452cafefbcd841e2bd90.pdf?index=trueIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_8e82e06ea98b4b53a1c10798d52ce4cd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92520f15-e7b1-4e26-bf6c-98dc38e6c519/44666848485.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84e0f29a-fb25-407a-8d0d-6c1ba526fa1a/95642825426.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/autodesk_inventor_fusion_for_mac_free.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/mujotogotobagozopivulebel.pdfIn PDF document text
    • http://zevusup.atwebpages.com/36008400164.pdfIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_db0aea74e1bf4067b0da9beaeaa64f4d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuzed/sexovapemetanibirotedida.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_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 5608 bytes
SHA-256: f55374bcfc9856571386164fc7b7cc8606d5a753e8e8ecae08b3198d4f5f3cd5
font_01_sfnt_off00010986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10986 10580 bytes
SHA-256: 73b5ad5f96c153603f4b00b0c0151aaae0ce862c880abc1b0a8d69e3340e9b45

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