Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5efb3aacf914c33…

MALICIOUS

PDF

70.2 KB Created: 2020-12-17 07:44:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 779fafb77be429eaf1764756bc68d33c SHA-1: ee1514617784a4ad1534061459615ad2670279ec SHA-256: b5efb3aacf914c335512b596d30f33d615596d23162714e1caf2ccd1b312316e
154 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged the PDF with high confidence. The embedded URL is presented as a lure related to building a shooting bench, suggesting a phishing or social engineering attempt to trick the user into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://ggtraff.ru/123?utm_term=how+to+build+a+homemade+shooting+bench In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418166/normal_5fdae3d98ea97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_5f8f615fe4222.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374380/normal_5fbf22af371b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452148/normal_5fc9ab8098e9d.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/a7732513-f2bc-433a-9a29-6ec22cd3166f/policy_brief_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99abe8d1-5c73-435d-98d4-0e740f7f12aa/dex_white_pages_spokane_washington.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/htaccess_php_error_reporting_off.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/adrenal_insufficiency_surgery_guidelines.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6c781c89b935f15ddc3c4/t/5fd159d70f163860c7a02769/1607555543434/ninja_raiden_revenge_v1_4._3_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4eb7247-d3b1-47d1-9fd8-7aafe3ba76f6/degiku.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0ed012e537a05ef0936a0/t/5fc2d2a13c6ccf69f3bc095d/1606603436836/everybody_hates_chris_season_1_episode_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/564576db-6e57-4260-a098-849cda7d34f2/74937564901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec67998-5eb7-48ed-8b25-1d02c4467d89/70136373853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/842e9717-7c12-4104-ae7f-fb095beb64db/rojipelas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a52c85-c0b2-4666-a852-75ab669592e7/befiganaboxulurubo.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_off0000d5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E6 5452 bytes
SHA-256: 045caba8622c9720b1407f668d80e699099b0906f40f72556a3487f50e043f7e
font_01_sfnt_off0000e857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE857 10276 bytes
SHA-256: ffbddad5c0848807395f91181a740b527de7458b15af7e4ed47beea0c1ccfe28

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