Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df90c253cb24ec5…

MALICIOUS

PDF

78.2 KB Created: 2021-03-18 09:51:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 64db4a48627308e5319e0d6596892d2a SHA-1: 53e0c4c2971d52916b72fd6fb3121e909856c56e SHA-256: 2df90c253cb24ec59f8c67ee5767c4af8d43a5e807a4bd7597acc86064b5bc56
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://kuzutuzo.ru/award?keyword=acrobat+pro+and+standard+comparison+pdf PDF link annotation
    • http://tonalemeketav.66ghz.com/9595927672.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/how_to_drain_a_portable_ac.pdfIn PDF document text
    • http://zutilituvinif.22web.org/platicas_de_bautizo_chihuahua.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bukumetaboxalo.epizy.com/slime_rancher_ps4_trophy_guide.pdfIn PDF document text
    • http://zitasixan.atwebpages.com/traxxas_summit_1_16_aluminum_upgrades.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95cd0d03-40ac-49e7-8741-785bfe0c5aac/english_grammar_worksheets_for_class_2nd.pdfIn PDF document text
    • http://kemubozureta.epizy.com/47243504268.pdfIn PDF document text
    • http://revuzulikasulo.epizy.com/algebra_substitution_worksheets_year_8.pdfIn PDF document text
    • http://xurosuforudev.atwebpages.com/what_does_the_serenity_prayer_mean_in_the_bible.pdfIn PDF document text
    • http://sonapap.rf.gd/public_finance_notes_for_b._com_2nd_year.pdfIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_ae0661d554a34155aa1a250f21acc42a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c76bcb4-5901-458d-8ae7-aa4b91ae68e8/mumoridosudedamalepagugul.pdfIn PDF document text
    • http://nawexox.epizy.com/genista_monspessulana_herbiguide.pdfIn PDF document text
    • http://wilaroxu.atwebpages.com/one_thousand_and_one_nights_sparknotes.pdfIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_a8e55c878311420f99de136217756372.pdf?index=trueIn PDF document text
    • http://jedejetitafabi.rf.gd/common_baking_sheet_sizes.pdfIn PDF document text
    • http://diwokisames.rf.gd/25951929549.pdfIn PDF document text
    • http://zaximibirada.epizy.com/kosubukididu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5532647-30d1-47be-99ca-c56b3ba99646/satugujupilomusi.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_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 5396 bytes
SHA-256: ac319cb5640df65662f01bfe74b768dc69e8de684502ff9f521193178afb1174
font_01_sfnt_off000105c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C0 10976 bytes
SHA-256: 878d9dcd30a47d2ef7d306cee77c62e06d5eae0d0dd8c99250ee75d82322360c

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