Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4aa56eb48c3afc…

MALICIOUS

PDF

78.8 KB Created: 2021-05-08 04:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0197dd329c9f60eb64a102559cba70d7 SHA-1: 949e1a03bfe574c2016be15efa7e2d87e62d2755 SHA-256: aa4aa56eb48c3afc9b6fce39b638d869333333ec81b6df9713f26d912ac0a0f4
186 Risk Score

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 0.9996

Heuristics 6

  • 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.
  • 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.
  • 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://maypoin.ru/strik?utm_term=power+xl+air+fryer+cooking+manual PDF link annotation
    • https://pukapukipek.weebly.com/uploads/1/3/4/6/134636258/2a45d756.pdfIn PDF document text
    • http://bumululoru.mywebcommunity.org/8752796472.pdfIn PDF document text
    • https://cdn.sqhk.co/kanemili/yihpNgd/ara_pacis_artista.pdfIn PDF document text
    • https://sijujufe.weebly.com/uploads/1/3/4/6/134696532/1342232.pdfIn PDF document text
    • https://cdn.sqhk.co/zegapoxasut/hj4heii/injustice_2_mobile_character_tier_list_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/nixafusoda/jdYroic/14781232557.pdfIn PDF document text
    • https://gitumakiwu.weebly.com/uploads/1/3/1/4/131437138/gotakaripalivolidar.pdfIn PDF document text
    • https://cdn.sqhk.co/raxasumo/bjbgiih/62350392637.pdfIn PDF document text
    • https://cdn.sqhk.co/nowegizin/ge9VThg/bootstrap_4_glyphicons_cheat_sheet.pdfIn PDF document text
    • https://wemawamirake.weebly.com/uploads/1/3/5/9/135959397/mekefinubu.pdfIn PDF document text
    • http://fevofawemuwa.medianewsonline.com/promissory_note_free.pdfIn PDF document text
    • https://misajutedatid.weebly.com/uploads/1/3/4/7/134755713/dd0df2107a.pdfIn PDF document text
    • http://pifofobexaxel.mypressonline.com/noxijogob.pdfIn PDF document text
    • https://joralonu.weebly.com/uploads/1/3/1/6/131607047/9475172.pdfIn PDF document text
    • http://kovafuwir.getenjoyment.net/54207101599.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_d47c78398da34d5b96e7455ebfe881a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c4ec765-5ae8-4927-89de-8d142741323f/65340707596.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a14bb8f-a5d7-4b35-8366-dfb990d1a773/luramurilotariwir.pdfIn PDF document text
    • http://dapilejebuvone.atwebpages.com/90161409075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d530fce6-7d83-48f5-8513-2994caad6e68/english_grammar_and_composition_class_8_solutions.pdfIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_55589c5528154cb58972932f3ae0fb5a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/095a0cf4-5141-482a-8921-da896ccbada9/ejemplos_de_oraciones_verbos_regulares_e_irregulares_en_ingles.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 5348 bytes
SHA-256: 0ffd36950f59243df99a963770488124ac7deff6597363c6afbc5e7b6d946f6a
font_01_sfnt_off0001065b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065B 11484 bytes
SHA-256: 7bb83b86c72504a44680556ffc9c1e99b093709ffa790b00f5bb5ffb6e593158