Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23541d889b38713…

MALICIOUS

PDF

80.5 KB Created: 2021-02-19 14:14:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e40f11b66dd72fe297401005b0e0b9da SHA-1: 85880ea882d90d6eda3c7ab69e45181dbee46931 SHA-256: b23541d889b387138b3efc16038bca129aae187732b9825c0b1e117e3fcfcd9a
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://baarspo.ru/wix?keyword=apush+period+2 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4499285/normal_5fc7efd72619b.pdfIn PDF document text
    • https://cdn.sqhk.co/logubaxe/faYvjhv/58243651800.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366630/normal_5fc8665aa638a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374983/normal_5ff4c1b897fa0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379969/normal_601d04ff124c4.pdfIn PDF document text
    • http://podarokinsta.online/pegopulofekewudzjics.pdfIn PDF document text
    • http://ig-supportcenter.xyz/jalimofosolufa9ryta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413223/normal_5fe676d7348de.pdfIn PDF document text
    • http://summ-green.fun/7828962949397tzv.pdfIn PDF document text
    • https://vekoduxiboba.weebly.com/uploads/1/3/1/3/131398498/ae7d817.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/diex1Ns/download_anime_battle_of_the_cosmos_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/muribirigim/pwM2pif/splendor_in_the_grass_movie_quotes.pdfIn PDF document text
    • http://idealicaitalia-official.site/vishnu_sahasranamam_meaningctfxm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485010/normal_5fe60ac549a3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446634/normal_600f35f6ae344.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405437/normal_5ff00202d4209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391605/normal_602bf9019b624.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/d3rUge6/bugatub.pdfIn PDF document text
    • https://xopisamu.weebly.com/uploads/1/3/0/7/130776659/78800ab94f020.pdfIn PDF document text
    • https://jawozararo.weebly.com/uploads/1/3/5/9/135964334/8224061.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65E 4928 bytes
SHA-256: 776f5357195dbe16c5de9ba7c96048c593c033880d2f495996a969f35a04c1d5
font_01_sfnt_off00010715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 1864 bytes
SHA-256: 7369cf8d173b7adc392fd72aca9b77c1a17930609b15ffb45705ea2e3c8057f7
font_02_sfnt_off00011046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11046 10592 bytes
SHA-256: 397baee44ac38979b2b53704d1823d04fb1dc71ed08d29ca0c57de1813c2c22c

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