Malicious PDF — malware analysis report

Static analysis result for SHA-256 1003e3a1bb64e580…

MALICIOUS

PDF

81.1 KB Created: 2021-03-23 20:22:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cfc11ce3308584c65477a4abe3558e8d SHA-1: 5941b05bac376745e545b3143b11645143b2f0fb SHA-256: 1003e3a1bb64e580d5bc8dcf0af45a23ccf70ed506274e99a508b099a9dd0096
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 0.9990

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=how+to+make+african+djembe+drums PDF link annotation
    • https://cdn.sqhk.co/gupuwiwi/VBPjhih/12379703727.pdfIn PDF document text
    • https://cdn.sqhk.co/mukibusu/jjibpje/21931643878.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/hcjdJB1/89500182116.pdfIn PDF document text
    • https://cdn.sqhk.co/namulofilox/Zhajggi/skiff_boats_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/iQCgw1I/7596366193.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/wegugiriwomijejawuninu.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Gijjhq7/vepoxonojimugapotap.pdfIn PDF document text
    • https://cdn.sqhk.co/perokokamosa/ic1iiYp/ding_ding_plush_throw_pillow.pdfIn PDF document text
    • http://ginupedarokuxu.getenjoyment.net/neonatal_sepsis_guidelines.pdfIn PDF document text
    • http://xolixelov.22web.org/leveling_guide_talonro.pdfIn PDF document text
    • http://biribekagupelu.66ghz.com/legugeligegujurejuzarur.pdfIn PDF document text
    • https://cdn.sqhk.co/zijigemeworu/jkzeNjN/yellow_fins_hernando_ms.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/hsqujcA/grand_prix_story_2_best_cars.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0c3b2bb2-3ac9-4e0e-a0b2-530a831cdf0d.filesusr.com/ugd/23193f_0b6aaafbf13540379c8a1d5cbd673828.pdf?index=trueIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_4dc8482cbe544c5ba9e0fb257be27166.pdf?index=trueIn PDF document text
    • https://cdd249b8-77b1-4a94-b024-8995efe4d959.filesusr.com/ugd/d394ff_a63a91dfc37b433388b46f5d17a915cb.pdf?index=trueIn PDF document text
    • https://8f1ef4f7-3f23-41ef-a3d6-4e5873a175a2.filesusr.com/ugd/d318ce_8e6d9a760d43445b8878dfa74c5b11b8.pdf?index=trueIn PDF document text
    • http://fipomazuwasa.epizy.com/mimukavoguwoxa.pdfIn PDF document text
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_eb24f705af4943e6baf68910615dff03.pdf?index=trueIn PDF document text
    • http://jedenibiripo.epizy.com/40195683595.pdfIn PDF document text
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_dbdaf5e66656443cb62ae3647d59dd07.pdf?index=trueIn PDF document text
    • https://a86a6b26-b473-4b55-b9aa-7628a2bff077.filesusr.com/ugd/4f270c_f3d53a0f8aa84b7481fd54fa4b6f35d2.pdf?index=trueIn PDF document text
    • http://lodagid.epizy.com/cantos_para_domingo_de_ramos_letra.pdfIn PDF document text
    • https://30fe55a9-f0c7-4aec-9bf5-b9d2225d99a8.filesusr.com/ugd/c4a51e_16c4965b33514610ac19ca2fd1d292b0.pdf?index=trueIn PDF document text
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_bfc2949cb30b485eb9e35ed3510eb074.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 5468 bytes
SHA-256: 23d01683481e5c69cb2f084dd426237687afe89d6fb623129421c68c7eb1ee99
font_01_sfnt_off000111b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B3 10760 bytes
SHA-256: 5d118dbdf1926b084359e6180b42c3ace307afb5749766287e9573d6c73776b9