Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2b8c7948182ad7…

MALICIOUS

PDF

75.1 KB Created: 2021-03-17 10:30:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d684d4c2f9b15542753a2be56083afd8 SHA-1: 9b52531a9d81c35b4f05bf272538f84e836b149e SHA-256: 8c2b8c7948182ad79d166a55d43c4d08f90a1bd4ce92864f0661315f6940e92a
156 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 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 0.9997

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/wix?keyword=double+sided+equations+with+brackets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412181/normal_600efbe606e53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426547/normal_603ac4cbc7ab7.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/kemowanixokipirazex.pdfIn PDF document text
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/340380236.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/kugoserowabod.pdfIn PDF document text
    • http://xizerunax.scienceontheweb.net/cabinet_minister_of_bihar_2020.pdfIn PDF document text
    • http://malanefire.sportsontheweb.net/hospital_architecture_design_book.pdfIn PDF document text
    • http://tezuveripoxub.mypressonline.com/wetega.pdfIn PDF document text
    • https://sudiseva.weebly.com/uploads/1/3/4/4/134470115/noxivitam_gilunitotutajex_nufufemosuzivij.pdfIn PDF document text
    • http://xidasetetobuge.scienceontheweb.net/75992818932.pdfIn PDF document text
    • https://xudomulur.weebly.com/uploads/1/3/4/0/134040538/xadukaregiva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/axgard_clear_glazing_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/education_esl_worksheets.pdfIn PDF document text
    • http://fataragoreb.myartsonline.com/fepapipexuvesanen.pdfIn PDF document text
    • http://jafixomedimun.onlinewebshop.net/is_trx_training_good.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/vikiku.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/nokefonokibosiv.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/how_to_clean_convection_oven_fan.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/50488933421.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/xidarifojadoxopilelig.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_off0000e5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AD 5448 bytes
SHA-256: 939ce745ffb619c7bfd03dcffc1699fa4448f63a1028def97c3cfa3d3a61fa0f
font_01_sfnt_off0000f83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 10812 bytes
SHA-256: 7175edfb0980ff0eed68a91b400fa139fd4e6bff4c35668ee2933b226dc2dffd

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