Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1de492ca1e3f964…

MALICIOUS

PDF

69.7 KB Created: 2021-01-17 03:42:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: cfd8d8734b03855f44a85ccbdf3f9aee SHA-1: efd4f59c7e98dcbeecc100c7db1fa0e554b383a6 SHA-256: c1de492ca1e3f964cf828377d41c3a91cf8e5a55eecd1d6b15bebade44685fb0
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains keywords related to 'VPN' and 'cracked', suggesting a lure for potentially malicious software downloads. The presence of numerous external PDF links further indicates a link farm designed to distribute malicious content or engage in SEO poisoning.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=vpn+for+android+apk+cracked In PDF document text
    • https://site-1196822.mozfiles.com/files/1196822/fadutisap.pdfIn PDF document text
    • https://site-1168511.mozfiles.com/files/1168511/77571554649.pdfIn PDF document text
    • https://revixapega.weebly.com/uploads/1/3/4/6/134619396/9594aa581.pdfIn PDF document text
    • https://site-1084247.mozfiles.com/files/1084247/vemawubatevobewigowene.pdfIn PDF document text
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/1ac45e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385009/normal_5f95169ede656.pdfIn PDF document text
    • https://site-1194115.mozfiles.com/files/1194115/squidward_crash_test_dummy_gif.pdfIn PDF document text
    • https://site-1178448.mozfiles.com/files/1178448/kerusetodavupenileg.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/mipeboro/platform_2_bhojpuri_song.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/dedijizofodibixonajix.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/countif_not_blank_smartsheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/how_to_calculate_capital_employed_balance_sheet.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_off0000d653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD653 4968 bytes
SHA-256: 0c0721d6a5c64bb6ba20863e8d1591ea32eff728a7685008edf1c23bc77d8132
font_01_sfnt_off0000e757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 10316 bytes
SHA-256: 37edab0096e666190150a04850141dc4b0cbab36e6f6b1c4db152d52b486fc5a

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