Malicious PDF — malware analysis report

Static analysis result for SHA-256 cea5c65b10ce0ba1…

MALICIOUS

PDF

79.7 KB Created: 2021-05-30 00:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 199a157e686499a09733c99664a60590 SHA-1: 1927566a0047b070a4355e260933c5111b02a5ab SHA-256: cea5c65b10ce0ba15013d09f6d037228dd8779065905c03d9cfa315e1b93787d
156 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 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://xezojetit.ru/strik?utm_term=human+resources+investigation+report+template+word PDF link annotation
    • https://tubababekegoso.weebly.com/uploads/1/3/4/8/134880125/koxiw-futuxofamuxitag-kenifuf.pdfIn PDF document text
    • https://satisetuxa.weebly.com/uploads/1/3/0/8/130813646/ab28ebda5bc3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407552/normal_5ff53317bc356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450141/normal_605028ef5e585.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367290/normal_6013cc0ed4b89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378152/normal_5fde1b92ea7aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390385/normal_60446a17a7514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481999/normal_600e697e344a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424696/normal_5fdbe17122d88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453889/normal_5fe0a8751f715.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410015/normal_602f25213777b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451210/normal_5fe6daeba3da1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405437/normal_5ff459330919d.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/e9713d01-ae3f-4927-9d9a-21ad9cf4327f/rudakisuveluminelavikif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e08faee-f790-47f5-9ead-f7fa8fe09723/why_does_my_miele_washing_machine_have_no_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a25e8099-7883-4b26-ad5d-e782b987fbad/48350297842.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf4bbd1-c8bf-4941-8aba-448d1b094b06/7795641452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5462bcdc-1849-48fd-b9ae-13bcdda0b545/ejercicios_resueltos_de_probabilidad_total.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbaf7168-9e55-4a63-877e-16e64714adc1/sueo_de_una_noche_de_verano_william_shakespeare_personajes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd230747-1c23-48fb-b738-ea336852e3cc/modivapunenonekur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77e4da21-282b-4dfa-ab01-338b0340497a/6099159960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fecebda5-1e74-4bc2-987b-7453780a2128/boots_to_business_revenue_readiness.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_off0000f924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 5504 bytes
SHA-256: 46e0a587ce81c282a73183065ed9a7e4ce0c9875f4e83f874530dd9f2cd90e0a
font_01_sfnt_off00010bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD3 11060 bytes
SHA-256: 734f2ab9c8a1f4a6513d7aebcb07e07af169b10b49943388998a98e94f8e1c29