Malicious PDF — malware analysis report

Static analysis result for SHA-256 08ef11632223b1f1…

MALICIOUS

PDF

81.1 KB Created: 2021-02-25 21:38:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 428d9b9b7dc4070c052347957ba3bc54 SHA-1: 801131f5b5a5192a5f1a0e6666e2e1a09e00b7db SHA-256: 08ef11632223b1f104fffe3615ea0a8a8509039ff99f619b32e0be2323856f50
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily corrupted, contains text related to PDF analysis and the wkhtmltopdf tool, suggesting a lure. The presence of multiple disposable domains and link farms further supports a phishing or malicious redirection attempt.

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=analyzing+short+stories+8th+edition+pdf+free In PDF document text
    • https://romarifekaxa.weebly.com/uploads/1/3/2/6/132683260/tijudat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412570/normal_5fe550d47d046.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460457/normal_600c6eada2a63.pdfIn PDF document text
    • https://voduvavib.weebly.com/uploads/1/3/4/0/134096125/4e45d5b85.pdfIn PDF document text
    • https://cdn.sqhk.co/samofetob/gcAWhcV/mowigomoduxuxusidemiku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384295/normal_5ffdf8a0b4ffd.pdfIn PDF document text
    • https://fotijaxak.weebly.com/uploads/1/3/4/1/134108731/jatamujopawa_menalize.pdfIn PDF document text
    • https://fupopafesuz.weebly.com/uploads/1/3/4/4/134443157/5ffe0cd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484355/normal_602060b2828bb.pdfIn PDF document text
    • https://towavakivuno.weebly.com/uploads/1/3/5/3/135318123/5842299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383131/normal_601d65da1047c.pdfIn PDF document text
    • https://cdn.sqhk.co/kigimijexap/gfZighf/minecraft_hypixel_skyblock_ip_address.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/piradi/candy_crush_soda_for_windows_8._1.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/wejipa.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/how_to_use_speed_queen_commercial_heavy_duty_washer.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/xemowafebunep.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/bonawaju.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_off000100e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 5640 bytes
SHA-256: 6db7fe67c6e61a9c2fd7c01da615bc014ff74fc2aa24a04108f792f8b87bc3d1
font_01_sfnt_off0001142b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142B 10148 bytes
SHA-256: bea6780816b8f9e65ffd1c28a8874d3322b797b843afd6a1ed3e7af8c2755c66

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