Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffc55b2853589182…

MALICIOUS

PDF

91.4 KB Created: 2020-11-10 13:27:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: edc44b876149cd10bff217e11ab1ee58 SHA-1: 2da3113733d964a9853df429bb5df585f080cbe7 SHA-256: ffc55b28535891829d988d1750ca23ae3654dcbb4c7e89b2c612e4f4bdc9dd54
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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?keyword=super+mario+flash+22 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380545/normal_5fa0794727765.pdfIn PDF document text
    • https://fixasamajiwige.weebly.com/uploads/1/3/4/3/134318971/1647496.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421767/normal_5f9a206e31798.pdfIn PDF document text
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/jimutip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387433/normal_5fa099308f1c3.pdfIn PDF document text
    • https://faxuledobiwud.weebly.com/uploads/1/3/4/3/134311760/nugazewu-fumukexedifoz.pdfIn PDF document text
    • https://lavulujataj.weebly.com/uploads/1/3/4/5/134576306/62287e7ef1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444104/normal_5fa0b08918f5a.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/nalifij/56628901464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbaa4e13-0cef-4ed6-ac53-428f0f2865e6/74036700491.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/bmw_gs_850_vs_1250.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/pokemon_go_apk_app_not_installed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd1865e8-af24-442e-83b7-aef5afeb1ad0/28681101520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e827a67-c35d-4dc1-8714-a5e41b528b12/motorola_h17_bluetooth_headset.pdfIn PDF document text
    • https://s3.amazonaws.com/sodoxi/automatic_control_systems_tenth_edition.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000138bf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x138BF 23168 bytes
SHA-256: 99d5ef60d84340f991219700a961961ca8b478b47bb77c9fe3aab772b0a4f943
font_00_sfnt_off0000f1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F4 4792 bytes
SHA-256: 5ee0748de72a30612527298303e029a569491efc6743be6fea5a8241aab3b009
font_01_sfnt_off00010260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10260 5376 bytes
SHA-256: fe1a63e88d48581f214247eebc0356774549beb73b86164f4feef09b8a574274
font_02_sfnt_off0001147e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147E 10728 bytes
SHA-256: 3e2382876f836544f788224f8d833d96fc11d9374a544e8c59db132c9e475770

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