Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ed84dfc5366265…

MALICIOUS

PDF

80.5 KB Created: 2020-12-14 19:41:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1a311838dfaa806a5bb79d74401bbb0e SHA-1: 91381ea52b3ffb3d5d97b286511a782a3714b961 SHA-256: b0ed84dfc5366265493214cd6654d34c70a64fd9a1e2e4daeb8afe26b0423f74
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 0.9990

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=smash+custom+music+alternative In PDF document text
    • https://cdn-cms.f-static.net/uploads/4413983/normal_5fa4c9845a91f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_5f8f59515f08b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f883646bbb3c.pdfIn PDF document text
    • https://vivimojegoduv.weebly.com/uploads/1/3/4/8/134890214/firilavenuku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369775/normal_5fb42b700882b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384649/normal_5f901b788fb79.pdfIn PDF document text
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/kumogor.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/c2f56564-24b3-4945-b813-6eaf92548fa7/23688098139.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1b1e1c89e1c4b8fc407cc/t/5fc7f290e08c080739ae6185/1606939282453/best_space_arcade_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0122ac5d-6d87-4d5f-a550-7e99b1a78fa5/stand_by_me.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9C 5204 bytes
SHA-256: 3270cc0bbc51fef8976ef4fe19b726e6abce5adebfe5bd6e0ae4b7e94fa65fe6
font_01_sfnt_off0000ee1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1F 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off0000f983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF983 10860 bytes
SHA-256: d40ac71cb811914d7af16849c9beadc8767b20eb15c8e960d496591c705fb6f2
font_03_sfnt_off00011ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC1 16332 bytes
SHA-256: 2a247a753e8a01f70d7fcfa74e2d7baad7259a755652018209d99d19020bd12c

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