Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f56d4e9842faaf…

MALICIOUS

PDF

74.2 KB Created: 2021-01-01 17:40:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b26ca5581fcc3471816ae81695c90fc6 SHA-1: 53c4c25bf6163ed044194eda684c5cf92a3f1fb0 SHA-256: e5f56d4e9842faafa872203f0081e927e6e61d974ca09a3e52ccc0398cb700bc
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links, with one critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Blockpost game download pc', suggesting a lure. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely for phishing or malware delivery.

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 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.
  • 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://gettraff.ru/strik?utm_term=blockpost+game+download+pc In PDF document text
    • https://zonerizarom.weebly.com/uploads/1/3/4/3/134310007/wupoda-gofeforemugeka-pajanirerudap.pdfIn PDF document text
    • https://cdn.sqhk.co/julukimesof/hggfjhR/18259278257.pdfIn PDF document text
    • https://cdn.sqhk.co/fosulavale/i5Yswje/begekomenegevaxesisogoz.pdfIn PDF document text
    • https://metidesu.weebly.com/uploads/1/3/4/4/134492072/558207.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/jirebonudur/nice_guidelines_menopause_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/75558043218.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/android_emulator_app_stopped.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/97641138616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d48927-e7b2-4eaf-9090-657a1ff670bd/gogudim.pdfIn PDF document text
    • https://s3.amazonaws.com/rutojo/group_objects_in_powerpoint_2010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06bb3794-863b-4960-ad57-221bf683bfca/dutegokubeluwopopofator.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/50_kw_abb_inverter_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/28377469303.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/rusifofamozukuralumubabet.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/science_lab_report_format_middle_school.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/addition_worksheets_with_regrouping_3_digits.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_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 5504 bytes
SHA-256: 7b5bb3726f93e87faf7095b7bbfd71a1f4821662212a0a4fb7fedd0491b1e8c2
font_01_sfnt_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 10732 bytes
SHA-256: eabcb26e78e0a98e60b71cd72d22226d1b692debdc0d3ca2a6d4689bef9a9c6f

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