Malicious PDF — malware analysis report

Static analysis result for SHA-256 328e8279916e9147…

MALICIOUS

PDF

76.1 KB Created: 2021-02-28 00:45:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fc874ef9d6d0015713a8807f5f365eb5 SHA-1: 4b748312fcad010870b4b0f916bf29352ca3cc34 SHA-256: 328e8279916e91474cdd1bdadfd5e77bd33146b2efa364b7958531d96c6a6a10
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'nipisod.ru', which is likely used to deliver a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, contains text related to 'Call of Cthulhu 7th edition', suggesting a lure to entice users to click the malicious link.

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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://nipisod.ru/award?keyword=call+of+cthulhu+7th+edition+keeper%2527s+screen PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446762/normal_5fe17ca933790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392871/normal_603739fed8746.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496607/normal_6001c0906ded3.pdfIn PDF document text
    • http://barurizex.iblogger.org/flute_music_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374521/normal_601bfa40b9763.pdfIn PDF document text
    • http://gufutaca6.xyz/84321849845hpgj6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366395/normal_600905e151dbc.pdfIn PDF document text
    • http://kutufirix.iblogger.org/budukogafofixeguxamed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475989/normal_603259a1d5af7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474191/normal_5fea12c027ec1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495400/normal_6026a94aadd61.pdfIn PDF document text
    • https:///cdn.shopify.comIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sarirepenibe.epizy.com/xedizuluvodevak.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/battle_cats_ganglion_true_form.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/44590192495.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE609 5324 bytes
SHA-256: a420c8080d4c9327410ed2de8710c874ae6985a5391d86e03cb2b693622f38a5
font_01_sfnt_off0000f82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 13644 bytes
SHA-256: 771846f22f3dd3153270240005e080a8ca30e2a4954ef4a80fddbf62eb1226dd

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