Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eb4cb73ea38449a…

MALICIOUS

PDF

72.3 KB Created: 2021-03-19 02:57:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9a853b71870350e1b52bf5a8a56536e8 SHA-1: 297fdab9839acec52a9522d657a707cde637bf9c SHA-256: 5eb4cb73ea38449a88938a4df0dc52ee9d7fc7d9adaf28af8b0ffcd67c17b9f5
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirector infrastructure, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URL and the link farm suggest an attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/strik?utm_term=rehras+sahib+path+pdf+download In PDF document text
    • http://inglassrus.ru/bizibamowexudapn6nr6.pdfIn PDF document text
    • http://good-production20.site/nuzowalugesanebosavatewovsgowi.pdfIn PDF document text
    • http://optamorem.com/773184974004c110.pdfIn PDF document text
    • http://airned.ru/35298631008744rm.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://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_bc1501d3085f4a0fb795f4cbbeea1cd7.pdf?index=trueIn PDF document text
    • http://bepibuxel.epizy.com/83484137157.pdfIn PDF document text
    • http://bedevekozazabe.rf.gd/nordictrack_t5.3_specs.pdfIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_9bc5544701ab4e6fa874ab477a673009.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ed1a6a9-2593-4e4e-a22d-37abf1639de6/54999726290.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_148e600a7fe444e3b5ce4c1d942fcbb1.pdf?index=trueIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_64c0e9a1bdf446d2bb57485ed96caf9e.pdf?index=trueIn PDF document text
    • http://livuwiga.rf.gd/aligarh_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/91774976981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63bf464b-c495-4468-b56f-0043a5d1c109/robert_kiyosaki_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf52bfd9-f6e1-4f37-94f3-e48035c5c05f/bogonusolemur.pdfIn PDF document text
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_60d757752351494ebe6be8fa3727a31b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/star_trek_movies_reddit.pdfIn PDF document text
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_aef1572b884244759565eba148e261c8.pdf?index=trueIn 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_off0000d115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD115 5156 bytes
SHA-256: 95c16e8a69e99e7b6be65c702ff7527982aeb7eb42ee1ef6303097b5012bb60b
font_01_sfnt_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 10376 bytes
SHA-256: 6c0015bc78914e7473644e9e0c4f14db582b8918b74c66b5415872ae2d9b623d
font_02_sfnt_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3