Malicious PDF — malware analysis report

Static analysis result for SHA-256 4251391a7f5efc6d…

MALICIOUS

PDF

72.1 KB Created: 2020-12-11 09:21:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3afa8cc82684d9f06cd0f6606df24ab5 SHA-1: b7eea056ddea377da877433688b0dc26bc78f6ac SHA-256: 4251391a7f5efc6d049a41265ca5dadf5fb78ece7fe2f83ffc65e4869ab17a3f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file exhibits characteristics of a link farm, containing numerous external links, with at least one identified as a malicious redirector. The ClamAV detection and ML classifier further support its malicious nature, likely intended to lure users to malicious websites or for SEO manipulation. No scripts were extracted from this sample.

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://gettraff.ru/aws?utm_term=non+woven+fabric+bag+making+manual+machine In PDF document text
    • https://bowotile.weebly.com/uploads/1/3/4/7/134759747/1245487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378834/normal_5f8a54a7b09ed.pdfIn PDF document text
    • https://zunuduzeguw.weebly.com/uploads/1/3/4/3/134344012/3947579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421970/normal_5fb348e386b10.pdfIn PDF document text
    • https://goresizusozal.weebly.com/uploads/1/3/4/5/134524816/kawofubedabuxuj_sijewesaseb_jezil.pdfIn PDF document text
    • https://figotuzu.weebly.com/uploads/1/3/4/5/134579221/1d890f9f8b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368982/normal_5f8c27b6ccc3e.pdfIn PDF document text
    • https://velizixevapejaj.weebly.com/uploads/1/3/4/3/134376636/95cf73edcb45.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3630b0ef-3ad3-45f9-98b0-b0399be2b4ce/black_hollow_cage_wikipedia.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/logo_design_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/25396068051.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/xikutefololupomoviwevuro.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/china_s_capital_city_s_former_name.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC685 5444 bytes
SHA-256: b06fd92f1a3e7a0519d6be6320faee1c0b64b7a07686c0adf1cd599ff364c5ef
font_01_sfnt_off0000d903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD903 10700 bytes
SHA-256: 1b043f00f80ac2369b4906aabb3b886c880146c129c83b1d4dcab18be5561cca
font_02_sfnt_off0000fd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 16140 bytes
SHA-256: 5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c

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