Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f863fcfaa96b9e…

MALICIOUS

PDF

119.5 KB Created: 2021-03-29 06:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 89d91c2a2349a265ab100c9778a0bd8c SHA-1: b0df3bece78f5a22e0a4ba01198f854bd747b57a SHA-256: 99f863fcfaa96b9ed64fd1ff4c28b5f9821ce3bf3caeb0b4da89786092cb2507
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://leonvi.ru/aws?utm_term=how+do+lutherans+interpret+the+bible PDF link annotation
    • http://shopyou.online/o_come_o_come_emmanuel_piano_guys_cecb8yp.pdfIn PDF document text
    • http://dkshlyap.ru/858044190762jehk.pdfIn PDF document text
    • http://fafigowe.22web.org/83192602818.pdfIn PDF document text
    • http://snatural.space/dunatirosqqj5.pdfIn PDF document text
    • http://vutatux.22web.org/suvemosape.pdfIn PDF document text
    • http://future-techno.ru/ch_8_chemistry_class_11zg8ay.pdfIn PDF document text
    • http://nixojomu.iblogger.org/paziju.pdfIn PDF document text
    • http://radapox.iblogger.org/88434757190.pdfIn PDF document text
    • http://panedapupugaxe.22web.org/kirig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://punifaz.epizy.com/boundary_scan_handbook.pdfIn PDF document text
    • https://77a5c3e7-429a-4f60-ad30-886abaef4f6e.filesusr.com/ugd/07a1ab_aa712de6b5e8475ca31fe67593c5b5d7.pdf?index=trueIn PDF document text
    • http://balopatesegefa.rf.gd/78661011455.pdfIn PDF document text
    • http://kojodidekojamu.rf.gd/domijowo.pdfIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_92bd8e8d7c404d87838bdf42544e7976.pdf?index=trueIn PDF document text
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_8f548d571e2a40328c85a4142f1ea3ec.pdf?index=trueIn PDF document text
    • http://puwagof.rf.gd/phonics_lesson_plans_for_preschool.pdfIn PDF document text
    • http://deroselewem.epizy.com/11648788524.pdfIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_55d20c4c8c6c448596ee5517ee9a13fe.pdf?index=trueIn PDF document text
    • http://tefozipo.epizy.com/aspartato_de_ornitina_bula.pdfIn PDF document text
    • http://xodepaberaxerop.rf.gd/android_tablet_emulator_for_pc_free.pdfIn PDF document text
    • http://lokokojorivumi.rf.gd/alphabet_letters_template.pdfIn PDF document text
    • http://vuduluxepo.epizy.com/tulja_bhawani_dj_song.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_off00019638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19638 5240 bytes
SHA-256: 8510fdc047f321d50753128b5ac6eb329470cd90d21f1821be9485015594824e
font_01_sfnt_off0001a803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A803 12128 bytes
SHA-256: c0251b499d7bdcaeaa4f4f93464b0a32877b10eb738a7e5d4034bc58226d750c

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