Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f18bfba2fb06cca…

MALICIOUS

PDF

63.1 KB Created: 2021-02-14 13:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 92bad22ad75e4dca22f621077283aeca SHA-1: b06798fdbf40348ada3fdf49f853b4d20f9f40b1 SHA-256: 2f18bfba2fb06cca55395aecf6db6cb29fc92da7d7a4275c8821b8e78905929a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest an attempt to direct users to a compromised or malicious hosting service.

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
  • 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.
  • 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://maypoin.ru/wix?keyword=escape+the+prison+unblocked PDF link annotation
    • http://gigazukiwizave.22web.org/beijing_normal_university_application_form.pdfIn PDF document text
    • https://cdn.sqhk.co/vopovaroxamo/jjgiPhg/my_touch_smart_timer_model_26892.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/f5vhjjj/97819296753.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/ifCqrX3/sound_equalizer_online_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375908/normal_5fc85b4924512.pdfIn PDF document text
    • https://cdn.sqhk.co/nosamese/f3qoRPL/tepuxotulesina.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471092/normal_5fc5e487b55f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387566/normal_5fe0340e82e6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459165/normal_60185605c9391.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gunololidomip.rf.gd/30251057536.pdfIn PDF document text
    • http://ninalosuza.rf.gd/wefawomuzesaxitibewu.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/access_apple_icloud_photos_from_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/87936331807.pdfIn PDF document text
    • http://tisiwiruligeg.epizy.com/gapaxoruto.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/2623511335.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_off0000bb24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB24 5324 bytes
SHA-256: bef470577a081a9d028391ca31e683bdee2b679d3231cf6cc34da39878f0616d
font_01_sfnt_off0000cd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD32 10160 bytes
SHA-256: e55fbbfecaaf2ec185e5a3d38c3526eb032dde13308d8a4ab51653e3b2a4621b

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