Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b8a8c7c9c435fe…

MALICIOUS

PDF

65.7 KB Created: 2021-03-01 06:05:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bc3270f9097beb26d4725812fb640468 SHA-1: 2814070d7ce7525f238a5fef6bf4409353075bbd SHA-256: d4b8a8c7c9c435fe040f5566c3cf78ef1ad9784fb29ef1c897981e57dd4ec6fb
184 Risk Score

Malware Insights

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

The PDF document exhibits malicious characteristics, including multiple embedded links pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous suspicious URLs suggests the document's primary function is to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/wix?keyword=pdf+midnight+in+the+garden+of+good+and+evil In PDF document text
    • http://hayatevesigar.online/mobogenie_apk_apk4funzr0oz.pdfIn PDF document text
    • https://nakagikirowi.weebly.com/uploads/1/3/2/6/132695306/cac3414.pdfIn PDF document text
    • http://prostosite.site/606490979006495j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470540/normal_600821a152ff8.pdfIn PDF document text
    • https://vavujajakakef.weebly.com/uploads/1/3/0/7/130740385/8700281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485705/normal_5fdc61111f0bc.pdfIn PDF document text
    • https://zamamuxito.weebly.com/uploads/1/3/4/2/134234866/1931281.pdfIn PDF document text
    • http://amst-watch-v1.club/clothes_dryer_repair_service_near_mek28w6.pdfIn PDF document text
    • https://lerofiputa.weebly.com/uploads/1/3/4/3/134367001/2d113.pdfIn PDF document text
    • https://cdn.sqhk.co/lazujanaziri/Mc0qijv/91266502036.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369796/normal_5fe1d0533c14e.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/bagokiko/81017971255.pdfIn PDF document text
    • http://borowif.epizy.com/zadiro.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/gone_with_the_wind_cast_members_still_alive.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_off0000c42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC42F 5204 bytes
SHA-256: 291b713916aa53674b19431b493b22382b4d3de28b538b560402a8589b88255d
font_01_sfnt_off0000d5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C1 10580 bytes
SHA-256: 5258bc35d8793faf60f08dd4a9aa79b65cfa8a9db0261b0d52dca0ae2e0bdf0d

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