Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c563f117f83056…

MALICIOUS

PDF

78.3 KB Created: 2021-02-19 12:16:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d5cd508dd12e5a1f869fcc346d179540 SHA-1: 5b067471fb0f184ab3be41df50c08f437937f725 SHA-256: a2c563f117f830561397015f6a2d2e56d30bf5e7e4412e5e155a49c21cd3b223
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 0.9996

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
  • 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://jacksth.ru/123?utm_term=chet+atkins+vince+gill PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4443803/normal_6013bf6959555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407749/normal_600fdf9497dcc.pdfIn PDF document text
    • https://retevewaluwur.weebly.com/uploads/1/3/4/6/134600892/8572689.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480588/normal_6021d894161b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491451/normal_602f25c4f12b2.pdfIn PDF document text
    • https://cdn.sqhk.co/bopibege/hcbihhj/gba_emulator_cheats_leaf_green.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499329/normal_5fdfa86fd697b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471230/normal_600ae07accd63.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472208/normal_5ff3841c6a660.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461205/normal_6003648b0f322.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451365/normal_600758f46bfd8.pdfIn PDF document text
    • https://kuwumezebuxe.weebly.com/uploads/1/3/4/1/134131528/449f04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415331/normal_5ff78988027ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387218/normal_5fcda19b474a8.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/fshjpge/survivalcraft_2_free_download_windows_7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460058/normal_6010360526bde.pdfIn PDF document text
    • https://teligodinawam.weebly.com/uploads/1/3/4/4/134457670/5034615.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496153/normal_5ff1c1198b553.pdfIn PDF document text
    • https://wexapifunoru.weebly.com/uploads/1/3/4/7/134715363/gunixapuluxolamewo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379233/normal_5fd8c73c0db7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366000/normal_5ffb5d17bcdbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382190/normal_6017482bbff35.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 4992 bytes
SHA-256: 046865fc0d80d370f8a0f8af0120512d6848e70ae940a5440bc709f512c88706
font_01_sfnt_off000109a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A2 9972 bytes
SHA-256: b4ce7071bc4be7a8fe81d8f85fa1dc3396da0f1ad2d71d979c87e8eea6a6dc5d

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