Malicious PDF — malware analysis report

Static analysis result for SHA-256 365876b1f3023324…

MALICIOUS

PDF

88.9 KB Created: 2021-01-15 05:01:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4ca5229e6f41f88f61defd7fa2a9ec7f SHA-1: e30a0040956d5c58fa5473fed2b5fc004eaacfd1 SHA-256: 365876b1f30233244a55a1aeb7c1753882d92bbc0a2d84f2192f40f7ddb80975
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://traffine.ru/aws?utm_term=latest+earthquake+report+in+india PDF link annotation
    • https://zosubidam.weebly.com/uploads/1/3/4/3/134316114/jiwawelada_nunimoripe_namafonoresuli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366335/normal_5fde216c3153b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373240/normal_5fc4f37c4cf9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426424/normal_5f9ae4539a667.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479678/normal_5ff5fc2e73286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384836/normal_5f9fa12669559.pdfIn PDF document text
    • https://site-1167941.mozfiles.com/files/1167941/emergency_alerts_android_app_download.pdfIn PDF document text
    • https://site-1178255.mozfiles.com/files/1178255/top_trending_video_songs_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474722/normal_5fc7cf7a8add7.pdfIn PDF document text
    • https://site-1168092.mozfiles.com/files/1168092/42482805490.pdfIn PDF document text
    • https://jetezoxow.weebly.com/uploads/1/3/1/3/131379231/sozefujeriso.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/xupovobejanam/juvanuxisomexolariro.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/guide_dmarches_administratives_aprs_dcs.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00012808.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12808 25324 bytes
SHA-256: a1ccf798ce64e57ae1ba5a3499e048a79e8052628d405b0871ba336307825db9
font_00_sfnt_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 5148 bytes
SHA-256: 11c553a554a328a1fa73f039e82163542c2fb03dbb3584c7703bd71993719f90
font_01_sfnt_off00010510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 10328 bytes
SHA-256: 4c09137b733e274425e5736637412ece40167704ad065ed1abc7956586f0392a

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