Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28527f9bedc3d94…

MALICIOUS

PDF

93.2 KB Created: 2021-05-28 09:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ae08f34368a5b6fb72780173796a3a91 SHA-1: ce49dca4d9a2b214ea6a0302a15157652ab379b9 SHA-256: b28527f9bedc3d940a2e13b927eb0778a27f98776442904e283782acab786ea3
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/123?utm_term=adobe+creative+cloud+desktop+app+offline PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369935/normal_600350b60008b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446773/normal_6037ad49da554.pdfIn PDF document text
    • https://jowapiwinutakun.weebly.com/uploads/1/3/4/3/134365581/pezored.pdfIn PDF document text
    • https://somubedalirome.weebly.com/uploads/1/3/4/7/134719542/mowusa_zazuwusejovisa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446170/normal_602a452fa5683.pdfIn PDF document text
    • https://siluxukazikuwo.weebly.com/uploads/1/3/5/3/135326211/1987813.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476924/normal_5fee29d8a3cb0.pdfIn PDF document text
    • https://nivojekegup.weebly.com/uploads/1/3/5/3/135322075/9421736.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445879/normal_5fe3bb78c2909.pdfIn PDF document text
    • https://dorubirema.weebly.com/uploads/1/3/4/3/134317311/woxos-mawazi-fuzizedesetaj-sezikidem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483604/normal_5fcbe2bb464e5.pdfIn PDF document text
    • https://mafoguwof.weebly.com/uploads/1/3/1/4/131438304/mupubidigopedoxageb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_600ff51dc5fe1.pdfIn PDF document text
    • https://giligigava.weebly.com/uploads/1/3/4/4/134494785/gipuxedimonatamekade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn 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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11526 5400 bytes
SHA-256: 4de63655b8b224577149c8e46216ffb1b30877b952d27c045789a8edd544260b
font_01_sfnt_off0001278c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278C 8988 bytes
SHA-256: 26ed420c52ac53bcfca3713e2c58260a32da10022bd481b91e9849c1138a7fe2
font_02_sfnt_off000140d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D3 11432 bytes
SHA-256: 5da12991fa9f61c75cb5f303475c95042437886973e6f60ae3f4ec8a9f4ec755

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