Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab371ab10f2676cc…

MALICIOUS

PDF

88.1 KB Created: 2020-12-08 10:54:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 655f34274995d3665cd8db90fad9cbd8 SHA-1: 92b51ecd664aea20785cc9bf61676166a4267b60 SHA-256: ab371ab10f2676ccddf8a4a09a1f0d2c299c4e086ce6ffbe2c6f6ca61423d522
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 0.9997

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
  • 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://traffking.ru/strik?utm_term=stellaris+tall+vs+wide+meaning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403823/normal_5fc141a63547b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404313/normal_5f9a39a08949c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_5f93b033a8207.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/bamudepekepa_setumazowido.pdfIn PDF document text
    • https://tefizaset.weebly.com/uploads/1/3/4/5/134587169/8519257.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403673/normal_5fc8ddcd8dc2a.pdfIn PDF document text
    • https://faxipanonuk.weebly.com/uploads/1/3/4/3/134352952/8155505.pdfIn PDF document text
    • https://tesazosutev.weebly.com/uploads/1/3/4/7/134714215/6d43eaaff6.pdfIn PDF document text
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/c5c1a6916.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dutuzanob/bahamas_gov_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/lusevilerezutavunoxezi.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/manual_testing_vs_automation_testing.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/81640781485.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/pennsbury_school_district_homes_for_sale.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BF 5080 bytes
SHA-256: 3ef7f64c7049c79a3821af6eb5a91466451c912c04c6fbe50d12044f3e403b03
font_01_sfnt_off000121ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EE 10312 bytes
SHA-256: 2be42813a4723fea360d13adfb29c99c8a06af43cd2782fe1d8cd0a65995e8c5
font_02_sfnt_off000144f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144F3 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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