Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e625944dc2b7ae…

MALICIOUS

PDF

65.8 KB Created: 2020-11-16 15:52:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: e074887dece6cc2db160076f0520f5cd SHA-1: 9adc305ed2b48a0a3f547c2f598d20449d4679a8 SHA-256: 27e625944dc2b7aeb6cfe6ef530778381cac9fbe83c1b53f01511da3317d67b6
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 0.9998

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
  • 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://traffmen.ru/123?utm_term=dream+league+2017+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4461483/normal_5fa51a41b383c.pdfIn PDF document text
    • https://vekaluledezo.weebly.com/uploads/1/3/4/2/134235689/galatejokizukadet.pdfIn PDF document text
    • https://kirobobu.weebly.com/uploads/1/3/4/5/134593563/7773194.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/dixaleko/archibald_macleish_j._b.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/key_employee_retention_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/digigitusuduk/60084590448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b11ddd-3415-4065-a520-822a0933e804/gakuxeguvidafudav.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/glaive_guisarme_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d056072-59d6-4560-aeb3-3bd3bba44c9e/ludovico_einaudi_nightbook_film.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/swfa_ss_3-15x42_sfp.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/eog_practice_math_3_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/70467376851.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/2071227414.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_off0000af95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF95 5428 bytes
SHA-256: afa54c2899ef463f058f60a15372d36bbbce7952fd15b7590455705ecef47853
font_01_sfnt_off0000c20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC20A 9864 bytes
SHA-256: c5428d48433c5d6e7f4bc08e905141d7f80759be5e1cab4307b71eb3a54ebcb1
font_02_sfnt_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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