Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed85bb783e37ac85…

MALICIOUS

PDF

64.4 KB Created: 2020-12-22 20:01:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 866423baced102898896eb82c8d53237 SHA-1: 302eb8c6fdec50f4187c0139fbdacc213f046236 SHA-256: ed85bb783e37ac8532f539c6e2bdfb94f668ba7993158d483be958d5f3747768
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, disguised as a free offer for Windows 7. This indicates a phishing attempt to lure users to a malicious site. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

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/aws?utm_term=windows+7+microsoft+free In PDF document text
    • https://static.s123-cdn-static.com/uploads/4392442/normal_5fcda73dbcc9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481065/normal_5fae231224d80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383567/normal_5f8ff7b71a9e6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pazovugal/nda_full_information_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/ibps_online_application_form_clerk_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/indian_food_recipes_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/42879766541.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/pudironuzaw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fceb9df703c0221cac6c897/t/5fd058b1b8bf0379e6085476/1607489714022/homeschool_options_in_charlotte_nc.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/amharic_orthodox_bible_81_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/81573418543.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/42664922625.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/japokaf.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc27aecc14dfd36fefb8ed8/t/5fc523895147b14804d70c20/1606755209747/snake_vs_block_skins_list.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_off0000c1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A9 5112 bytes
SHA-256: a535347c1b5fa4dda57a70638eb1cd03e18e46d792af6ecd11d71020a3ef0bfa
font_01_sfnt_off0000d317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD317 9876 bytes
SHA-256: 67aafc503b2931c6c97adaf12c986b73ed9fc85227b4a0ddce12f6c986511762

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