Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad2d85aa23e8efc…

MALICIOUS

PDF

73.7 KB Created: 2021-03-30 07:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fb0a56e85536c471d342f6f135664d07 SHA-1: 1a419fcd93b0953f0f3ce451600772b3b505491d SHA-256: 2ad2d85aa23e8efc0b408e591ddf6e036713720bc5422c6ab99f2ebfd6c7979f
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 0.9998

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 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://gimoguvi.ru/strik?utm_term=how+to+find+lattice+energy+of+a+compound PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415065/normal_6053bb58ef804.pdfIn PDF document text
    • https://welukixavise.weebly.com/uploads/1/3/1/0/131069839/lumikitozapis_ripunulawav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409798/normal_600923801dd8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452400/normal_60403b605e4f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422168/normal_6059a43c2f076.pdfIn PDF document text
    • https://sekojeti.weebly.com/uploads/1/3/4/5/134583019/gikujojorisaxinijevu.pdfIn PDF document text
    • http://nubidatum.22web.org/how_do_u_say_get_married_in_french.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391909/normal_605fa9e22b056.pdfIn PDF document text
    • https://posodukur.weebly.com/uploads/1/3/4/3/134347560/ab128.pdfIn PDF document text
    • https://roxodebovak.weebly.com/uploads/1/3/1/4/131454305/4614c270e807.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_eb0bbf277cd940719941afaa8a85c71b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/juzinukisarit.pdfIn PDF document text
    • https://10bc5e17-7652-4c7e-9b43-999b3eb3b021.filesusr.com/ugd/5edc69_6d87c3a2a0894711b831409d687b840c.pdf?index=trueIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_3d544a1a788740188a96f14b60d3f7eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/norivufed.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/jokefujoxarevizufet.pdfIn PDF document text
    • http://piguzivi.epizy.com/carranza_periodontics_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/ropedejavozawulawubo.pdfIn PDF document text
    • http://xowevabi.epizy.com/bazeg.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_off0000e34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34A 5452 bytes
SHA-256: 29464aa2acd4d80b7c025eb2926ab2f2731a8d81e66af14076227f0b324dac24
font_01_sfnt_off0000f5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 10448 bytes
SHA-256: 3de5d1d1889df12decf0da7a9c1632887f73efcfef8c3587610fc20a69b683a7

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